Enhanced Resistance to Delayed Cracking in Deep-drawn Lean Duplex Stainless Steel: the Role of Residual Stress
Creators
- 1. Pohang University of Science and Technology, Pohang (Korea, Republic of)
- 2. Kumamoto University, Kumamoto (Japan)
- 3. POSCO, Pohang (Korea, Republic of)
Description
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.
Additional details
Publishing Information
- Journal Title
- Journal of the Korean Institute of Metals and Materials
- Journal Volume
- 55
- Journal Issue
- 8
- Series
- 22 refs, 9 figs, 1 tab
- Journal Page Range
- p. 544-549
- ISSN
- 1738-8228
INIS
- Country of Publication
- Korea, Republic of
- Country of Input or Organization
- Korea, Republic of
- INIS RN
- 50043547
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- CASTING; CONTROL; CRACKING; DUCTILITY; ELONGATION; HYDROGEN; HYDROGEN EMBRITTLEMENT; MECHANICAL PROPERTIES; MICROSTRUCTURE; NICKEL ALLOYS; PERFORMANCE; RESIDUAL STRESSES; SENSITIVITY; STAINLESS STEELS; STRAINS; TRANSFORMATIONS
- Descriptors DEC
- ALLOYS; CARBON ADDITIONS; CHEMICAL REACTIONS; DECOMPOSITION; DEFORMATION; ELEMENTS; EMBRITTLEMENT; FABRICATION; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; NONMETALS; PYROLYSIS; STEELS; STRESSES; TENSILE PROPERTIES; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT ALLOYS