期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.10.067
关键词
316 LN austenitic stainless steel; Cryorolling; Microstructure; Mechanical properties; Deformation-induced martensite transformation
类别
资金
- National Natural Science Foundation of China [50801021, 51201061]
- Program for Science, Technology Innovation Talents in Universities of Henan Province [17HASTIT026]
- Science and Technology Project of Henan Province [152102210077]
- Education Department of Henan Province [16A430005]
- International Cooperation Project from Henan Province [172102410032]
- Science and Technology Innovation Team of Henan University of Science and Technology [2015XTD006]
Microstructure evolution and mechanical properties of AISI 316 LN austenitic stainless steel (SS) after cryoroiling with different strains were investigated by means of optical, scanning and transmission electron microscopy, X-ray diffractometer, microhardness tester, and tensile testing system. The deformation-induced martensite transition and the deformation microstructure occurred during cryorolling process were always composed of high-density dislocations, deformation twins, and deformation-induced martensites. Following the strain, the dislocation density in deformation microstructure approached saturation state and the volume fraction of deformation twins combined with deformation-induced martensites increased significantly. At the 70% strain, original austenite was transformed into martensite completely. Further increasing the strain to 90% would refine the martensitic lamellae to nanoscale. The deformation degree also led to remarkable increase of the strength and hardness of the cryorolled SS, and drastic reductions of the elongation. Due to the cryorolling, the tensile fracture morphology changed from typical ductile, rupture to a mixture of quasi-cleavage and ductile fracture.
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