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Korean Journal of Metals and Materials > Volume 55(8); 2017 > Article
Korean Journal of Metals and Materials 2017;55(8): 544-549. doi: https://doi.org/10.3365/KJMM.2017.55.8.544
Enhanced Resistance to Delayed Cracking in Deep-drawn Lean Duplex Stainless Steel: the Role of Residual Stress
Seok Hwan Jung1, Taekyung Lee2, Seok Weon Song1, Young Jin Kwon1, Hyung-Gu Kang3, Dongchul Chae3, Chong Soo Lee1
1Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
2Magnesium Research Center, Kumamoto University, Kumamoto 860-8555, Japan
3Stainless Steel Research Group, POSCO, Pohang 37859, Republic of Korea
Correspondence  Taekyung Lee ,Tel: +81-96-342-3576, Email: t-lee@mech.kumamoto-u.ac.jp
Chong Soo Lee ,Tel: +82-54-279-9001, Email: cslee@postech.ac.kr
Received: 18 January 2017;  Accepted: 27 March 2017.  Published online: 1 August 2017.
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, whereas the MASS specimens showed typical intergranular fractures after the hydrogen charging. In particular, the LDSS exhibited a superior limiting drawing ratio in spite of the large amount of internal hydrogen as well as high sensitivity to hydrogen embrittlement. The high resistance to delayed cracking originated from the relatively lower residual stress generated during the deep drawing process. This is a consequence of the suppression of martensitic transformation in the LDSS, due to Mn partitioning.
Keywords: delayed cracking, stainless steel, hydrogen, residual stress, martensite
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