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Impact Toughness and Softening of the Heat Affected Zone of High Heat Input Welded 390 MPa Yield Strength Grade TMCP Steel
항복강도 390 MPa급 가공열처리강 대입열용접 열영향부 충격인성 및 연화현상
Kook-Soo Bang, Young-Ho Ahn, Hong-Chul Jeong
방국수, 안영호, 정홍철
Korean J. Met. Mater. 2018;56(11):796-804.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.796

Abstract
The Charpy impact toughness of the heat affected zone (HAZ) of electro gas welded 390 MPa yield strength grade steel, manufactured by a thermo mechanically controlled process, was investigated. The effects of added Nb on the toughness of the steel and the factors influencing scatter in toughness are discussed in..... More

                        
Effect of BN Addition on the Mechanical Properties of TiN-BN Composites
Woo-Jin Cho, In-Jin Shon
Korean J. Met. Mater. 2018;56(9):658-663.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.658

Abstract
Titanium nitride (TiN) has been used extensively in coating materials and cutting tools because of its attractive properties, which include low density, high melting point, high hardness and thermodynamic stability. However, like many ceramic materials, its low fracture toughness limits wide industrial application. The methods generally utilized to improve its..... More

                        
Effects of Si on the Characteristics of FCA Multi-Layer Weld Metal with 460 MPa Yield Strength Grade Steels for Ships and Marine Structures
선박 및 해양구조물용 항복강도 460 MPa급 강재의 FCA 다층 용접금속부 특성에 미치는 규소의 영향
Jong-Sig Kim, Myeong-Soo Lee, Jong-Min Jung, Han-Geul Choi, Sang-Hoon Jeong, Chang-Yong Kang
김종식, 이명수, 정종민, 최한글, 정상훈, 강창룡
Korean J. Met. Mater. 2018;56(7):499-504.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.499

Abstract
This study investigated the effect of Si on the characteristics of FCA multi-layer weld metal with 460 MPa yield strength grade steels for ships and marine structures. The effect on microstructure was evaluated by tensile, charpy impact and CTOD testing of 4 FCAW welds containing various C and Si contents...... More

                        
Effect of Hot Forging and Heat Treatment on the Microstructure and Mechanical Properties of Cr Steel
Cr강의 미세조직과 파괴인성에 미치는 열간단조 및 열처리 공정의 영향
Dong Jun Lee, Yong-Nam kwon, Min Suk Kim, Ga Eun Ku, Sang Hyun Heo, Nam Yong Kim, Jin-Mo Lee
이동준, 권용남, 김민석, 구가은, 허상현, 김남용, 이진모
Korean J. Met. Mater. 2018;56(3):221-226.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.221

Abstract
In this study, the effects of hot forging and heat treatment (quenching and tempering) of cast Cr alloy steel on the microstructures and mechanical properties were investigated. The hot forging was performed at a compressive ratio 0.5 at 1,250 oC. The heat treatment process was quenching (860 oC for 2..... More

      
Effects of Microstructure Variation on Tensile and Charpy Impact Properties in Heavy-Section SA508 Gr.3 Low Alloy Steels for Commercial Reactor Pressure Vessel
SA508 Gr.3 상용 원자로용기강의 두께방향 미세조직 변화가 인장 및 충격특성에 미치는 영향
Seokmin Hong, Cholong Lee, Min-Chul Kim, Bong-Sang Lee
홍석민, 이초롱, 김민철, 이봉상
Korean J. Met. Mater. 2017;55(11):752-759.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.752

Abstract
In this study, the effects of microstructural variations in heavy-section reactor pressure vessel (RPV) steels on tensile and Charpy impact properties were investigated. Two PRV blocks, OPR1000 and APR1400 (ORV, ARV) were taken from the archive materials used in Korea standard nuclear power plants. Test specimens were sampled from five..... More

         Cited By 1
Effect of Incremental Displacement on the Fracture Resistance Curve of Nuclear Piping Materials under Reverse Cyclic Loading
역사이클 하중의 증분변위가 원전배관 재질의 파괴저항곡선에 미치는 영향
Sang-Young Kim
김상영
Korean J. Met. Mater. 2017;55(2):85-90.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.85

Abstract
Reverse cyclic loading introduces alternatinf tensile and compressive loads to a structure. Several researchers have reported that a reverse cyclic load decreases the fracture resistance curve of carbon steel. In this paper, the fracture toughness of SA312 TP304 stainless steel, which is a nuclear piping material, was investigated under a..... More

      
Mechanical Behavior
Sensitivity of Microstructural Factors Influencing the Impact Toughness of Hypoeutectoid Steels with Ferrite-Pearlite Structure using Multiple Regression Analysis
다중회귀분석을 이용한 페라이트-펄라이트 조직 아공석강의 충격인성에 미치는 미세조직적 인자의 민감도 해석
Seung-Yong Lee, Sang-In Lee, Byoungchul Hwang
이승용, 이상인, 황병철
Korean J. Met. Mater. 2016;54(9):637-644.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.637

Abstract
In this study, the effect of microstructural factors on the impact toughness of hypoeutectoid steels with ferrite-pearlite structure was quantitatively investigated using multiple regression analysis. Microstructural analysis results showed that the pearlite fraction increased with increasing austenitizing temperature and decreasing transformation temperature which substantially decreased the pearlite interlamellar spacing and..... More

         Cited By 2
Powder Metallurgy
Fabrication and Mechanical Properties of Nanostructured TiC-TiAl by the Pulsed Current Activated Sintering
펄스전류 활성 소결에 의한 나노구조 TiC-TiAl 제조 및 기계적 성질
Bong-Won Kwak, Byung-Su Kim, Jin-Kook Yoon, Kyung-Tae Hong, In-Jin Shon
곽봉원, 김병수, 윤진국, 홍경태, 손인진
Korean J. Met. Mater. 2016;54(8):566-572.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.566

Abstract
TiC-Co or TiC-Ni hard materials have been used for cutting tools. However, the high cost and the low hardness of Ni or Co, and the low corrosion resistance of the TiC-Ni and TiC-Co cermets have generated interest in recent years in using them as alternative binder phases. In this study,..... More

         Cited By 3
n FCA
박수길 · 조영호 · 지춘호 · 이정훈 · 서성문· 강남현

Received 2018 Oct 5     Accepted 2018 Nov 17     Published online 2018 Dec 14
Abstract
The hot crack resistance and mechanical properties of flux cored arc (FCA) welds were investigated with three kinds of welding consumables having different boron (B) and manganese (Mn) contents for high strength carbon steel. The hot crack resistance, measured from self-restraint testing, strongly depended on the amount of B in the... More
      
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