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Korean J. Met. Mater.
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Korean J. Met. Mater.
2019;57(7):405-411. Published online 2019 Jun 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.7.405
Abstract
This paper discusses a molybdenum-added alloy design for normalized pressure vessel steels, to reduce hydrogen induced cracking (HIC) and inhibit crack propagation. The change in microstructure produced by the modified alloy composition was analyzed to determine its effect on HIC characteristics. The microstructural change was observed by optical microscopy, hardness.....
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Korean J. Met. Mater.
2019;57(6):390-395. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.390
Abstract
We demonstrate a synthetic route to high-quality Sn microcrystals using thermal chemical vapor deposition (CVD) in a hydrogen-reducing atmosphere. During thermal CVD with SnO2 powder, a mixture of Ar and H2 (4%) gases was used as a carrier gas to maintain a hydrogen reduction environment. Hydrogen maintained a reduction environment.....
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Korean J. Met. Mater.
2019;57(4):245-250. Published online 2019 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.4.245
Abstract
Copper leaching from low-grade copper ore samples obtained from two active mines in the US, named conichalcite (sample A) and chalcopyrite (sample B), were studied under different leaching conditions using sulfuric acid and methane sulfonic acid (MSA). The conichalcite, sample A, is calcium-copper arsenite hydroxide [CaCu(AsO4)(OH)] with small amount of.....
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Zr-2.5%Nb 압력관 재료에서 수소 농도와 균질화 처리 온도에 따른 수소화물 석출 거동
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임상엽, 김성수, 이경근
Korean J. Met. Mater.
2019;57(4):203-213. Published online 2019 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.4.203
Abstract
The precipitation characteristics of hydrides in Zr-2.5% Nb pressure tube material were investigated for various hydrogen concentrations and homogenization temperatures. A surface hydride was formed using the electrolytic method and homogenized at various temperatures up to at 550 oC. The homogenization treatment was carried out at 300-550 oC over 240.....
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Korean J. Met. Mater.
2019;57(3):176-183. Published online 2019 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.176
Abstract
In the present work, MgH2 was doped with Zn(BH4)2, Ni, and/or Ti to improve its hydrogen absorption and release features. Samples were prepared by grinding in a planetary ball mill in a hydrogen atmosphere. To increase the hydrogen absorption and release rates without significantly sacrificing hydrogenstorage capacity the additive percentages.....
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Korean J. Met. Mater.
2019;57(3):162-169. Published online 2019 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.162
Abstract
During the extraction of metal ions from a weak acidic chloride solution by ionic liquids consisting of an organophosphorus extractant and Aliquat 336, the equilibrium pH is sometimes observed to be higher than the initial pH. To compare the hydrogen ion extraction behavior of tertiary and quaternary amines, Alamine 336,.....
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전기 방사를 이용한 1D / 2D 하이브리드 구조 고활성 MoS
2
/ CNF 수소 발생 촉매의 합성 및 특성 분석
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이정훈, 박유세, 장명제, 박성민, 이규환, 최우성, 최승목, 김양도
Korean J. Met. Mater.
2018;56(12):885-892. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.885
Abstract
Molybdenum disulfide (MoS2) based electrocatalysts have been proposed as substitutes for platinum group metal (PGM) based electrocatalyst to hydrogen evolution reaction (HER) in water electrolysis. Here, we studied MoS2/CNFs hybrid catalyst prepared by electrospinning method with heat treatment for polymer electrolyte membrane(PEM) water electrolysis to improve the HER activity. The.....
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Cited By 1
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Korean J. Met. Mater.
2018;56(12):878-884. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.878
Abstract
In the present work, we selected a polymer, polyvinylidene fluoride (PVDF), as an additive to improve the hydrogenation and dehydrogenation properties of Mg. 95 wt% Mg + 5 wt% PVDF (designated Mg-5PVDF) samples were prepared via milling in hydrogen atmosphere (reactive milling), and the hydrogenation and dehydrogenation characteristics of the.....
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Cited By 2
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Korean J. Met. Mater.
2018;56(11):829-834. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.829
Abstract
Although magnesium-based alloys are attractive materials for hydrogen storage applications, their activation properties, hydrogenation/dehydrogenation kinetics, thermodynamic equilibrium parameters, and degradation characteristics must be improved for practical applications. Further, magnesium poses several risks, including explosion hazard, environmental pollution, insufficient formability, and industrial damage. To overcome these problems, CaO-added Mg alloys, also.....
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Korean J. Met. Mater.
2018;56(8):620-627. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.620
Abstract
In our previous work, samples with a composition of 95 wt% Mg + 5 wt% CMC (Carboxymethylcellulose, Sodium Salt, [C
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) (named Mg-5 wt%CMC) were prepared through hydride-forming milling. Mg-5 wt%CMC had a very high hydrogenation rate but a low dehydrogenation rate. Addition of Ni to Mg is known to increase.....
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Cited By 1
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Korean J. Met. Mater.
2018;56(8):611-619. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.611
Abstract
TaF
5
and VCl
3
were chosen as additives to enhance the hydrogen uptake and release rates of Mg. The total content of the additives was not more than 10 wt% since too high content reduces the fraction of Mg and thus the hydrogen storage capacity of the alloys. Samples with compositions.....
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Cited By 4
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탄소함량이 자동차용 초고강도 철강소재의 부식 및 수소 확산 거동에 미치는 영향
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황은혜, 성환구, 김성진
Korean J. Met. Mater.
2018;56(8):570-579. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.570
Abstract
Recently developed ultra-strong GIGA STEEL exhibites superior mechanical properties, with a high tensile strength of more than 1.5 GPa and good impact toughness. Nevertheless, its application to auto parts has been severely restricted, mainly due to a substantial reduction in the resistance to hydrogen embrittlement (HE) induced by aqueous corrosion......
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Cited By 1
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Korean J. Met. Mater.
2018;56(7):524-531. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.524
Abstract
To improve the hydrogen uptake and release properties of magnesium (Mg), five weight percent of graphene was added to pre-milled Mg by milling in hydrogen (reaction-involving milling). The hydrogen uptake and release properties of the graphene-added Mg (named Mg-5graphene) were investigated. Premilling of Mg (for 24 h) and then adding.....
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Cited By 4
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Korean J. Met. Mater.
2018;56(5):406-411. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.406
Abstract
Industrially meaningful hydrogen production process from mixture or syngas certainly must have a cooling process, which is typically pressure swing adsorption (PSA). However, the PSA process involves an exothermic reaction during adsorption. Recently, hydrogen separation research has been in progress in order to develop a cooling process to minimize or.....
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Cited By 1
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Korean J. Met. Mater.
2018;56(5):392-399. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.392
Abstract
The addition of CMC (Carboxymethylcellulose, Sodium Salt) may improve the hydriding and dehydriding properties of Mg since it has a relatively low melting point and the melting of CMC during transformation-involving milling may put the milled samples in good states to absorb and release hydrogen rapidly. Samples with compositions of.....
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Cited By 4
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Korean J. Met. Mater.
2018;56(3):244-251. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.244
Abstract
Samples with compositions of 99 w/o MgH
2
+1 w/o Zn(BH
4
)
2
(designated MgH
2-
1Zn(BH
4
)
2
) and 96 w/o MgH
2
+2 w/o Zn(BH
4
)
2+
2 w/o Ni (designated MgH
2-
2Zn(BH
4
)
2-
2Ni) were prepared by milling in a planetary ball mill in a hydrogen atmosphere (reaction-involving milling). The hydrogen release properties of MgH
2-
1Zn(BH
4
)
2
and MgH
2-
2Zn(BH
4
)
2-
2Ni were compared. A larger quantity.....
More
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Korean J. Met. Mater.
2018;56(2):155-162. Published online 2018 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.2.155
Abstract
In this work, MgH
2
, Mg
2
Ni, and Ni were added to Mg in order to improve the hydrogen-storage properties of Mg. A 84 wt% Mg + 10 wt% MgH
2
+ 5 wt% Mg
2
Ni + 1 wt% Ni sample (designated the Mg-based sample) was prepared by milling under a hydrogen atmosphere in.....
More
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Korean J. Met. Mater.
2018;56(1):59-65. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.59
Abstract
In this work, Mg
2
Ni and Ni were added to MgH
2
in order to improve the hydrogen-storage properties of Mg. A 94 wt% MgH
2
+5 wt% Mg
2
Ni+1wt% Ni (named 94MgH
2
+5Mg
2
Ni+1Ni) sample was prepared by milling in a hydrogen atmosphere in a planetary ball mill for 5 h. The Mg
2
Ni was hydrided during.....
More
Cited By 4
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베이나이트계 X70강 수소가압분위기 인장시험의 수소취성균열 전파
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최병학, 장현수, 이범규, 김의수, 김우식, 백운봉, 남승훈
Korean J. Met. Mater.
2018;56(1):1-7. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.1
Abstract
This study investigated hydrogen induced cracking (HIC) of X70 steel, used for gas pipeline material, with a bainitic microstructure. The effect of hydrogen on the steel was investigated by tensiletesting in a high pressure hydrogen atmosphere, using OM, SEM and TEM analyses. The mechanisms of hydrogen-related cracking were represented as.....
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Cited By 1
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수소 주입 방식에 따른 세 고망간강의 수소 취화 거동 비교
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이승용, 황병철
Korean J. Met. Mater.
2017;55(10):695-702. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.695
Abstract
In this study the hydrogen embrittlement characteristics of three high-manganese steels were tested using different hydrogen charging methods, and the results were compared with various Mn-containing steels. The results showed that the hydrogen embrittlement susceptibility of the high-manganese steels increased with increasing inherent strength because deformation mechanisms, such as deformation.....
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Korean J. Met. Mater.
2017;55(9):657-663. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.657
Abstract
Abstract: In this work, Zn(BH
4
)
2
was added to improve the hydrogen-storage properties of MgH
2
. A 99 wt% MgH
2
+1 wt% Zn(BH
4
)
2
sample was prepared by milling in a planetary ball mill in a hydrogen atmosphere. The proportion of the added Zn(BH
4
)
2
was small (1 wt%) in order to increase hydriding and.....
More
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Korean J. Met. Mater.
2017;55(9):615-623. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.615
Abstract
Mill-annealed Ti-6Al-4V (Ti64) sheets were formed into rectangular shaped pans with two square recesses by the superplastic forming (SPF) technique under high pressure using commercial grade argon gas. The SPF process induced a significant decrease in the tensile ductility and high cycle fatigue (HCF) resistance of the Ti64 alloy. The.....
More
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Korean J. Met. Mater.
2017;55(8):544-549. Published online 2017 Aug 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.8.544
Abstract
The delayed cracking behavior of deep-drawn lean duplex stainless steel (LDSS) was investigated, and compared with that of conventional metastable austenitic stainless steels (MASS). Hydrogen charging was performed by electrochemical method, and the hydrogen-charged specimens were subjected to the slow-strain-rate test. Fractures occurred along the phase boundaries in the LDSS,.....
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API X70MS 라인파이프용 강의 수소유기균열 감수성에 미치는 미세조직의 영향
J
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성준호, 심호섭, 박병규, 조경목
Korean J. Met. Mater.
2017;55(6):379-385. Published online 2017 Jun 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.6.379
Abstract
The resistance of hydrogen induced cracking (HIC) was investigated with different microstructures of API X70MS steel. Ferrite/acicular ferrite (F/AF), deformed ferrite/acicular ferrite, ferrite/bainite (F/B) and single acicular ferrite (AF) were obtained by thermo-mechanical controlled process (TMCP) with changing rolling and cooling conditions. HIC resistance was found to be affected by.....
More
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(
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)
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Korean J. Met. Mater.
2016;54(12):916-924. Published online 2016 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.12.916
Abstract
In this work, niobium (V) fluoride was selected as an additive to heighten the hydrogen sorption rates of Mg. Specimens of pure Mg, 5 wt% niobium fluoride－added Mg, and 10 wt% niobium fluoride-added Mg were prepared by planetary ball milling in hydrogen. The hydrogen sorption properties of the specimens were.....
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Cited By 4
H
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C
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6
5
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Junghoon Lee1, Myeonghyun Kim2, Yeongdo Park3, Cheolho Park4, Cheolhee Kim5, and Namhyun Kang1,*
Received 2019 May 7 Published online 2019 Jul 11
Abstract
Hydrogen-induced cracking (HIC) behavior was analyzed for gas metal arc (GMA) and laser beam (LB) welds on American Petroleum Institute (API) X65 steel. The GMA welds consisted of acicular ferrite (AF) with some widmanstatten ferrite (WF), while the LB welds had bainitic ferrite (BF) with some AF. The welds and...
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