许淳淳1; 徐瑞芬1; 欧阳维真1; 姜宝文1; 吴永炘2
Xu Chunchun1; Xu Ruifen1; Ouyang Weizhen1; Jiang Baowen1; Wing-yan Ng2
摘要: Specimens of AISI 321 stainless steel (0Cr18Ni9Ti) of various martensite contents were prepared by the low temperature(-70℃
) elongation method.X-ray diffraction (XRD) and transmission electron micrograph (TEM) techniques were used to study the
phase transition process and its structure.The relationship between deformation-induced martensite and stress corrosion
cracking (SCC) susceptibility of the steel in 42% (boiling)MgCl2 solution was investigated using the constant load SCC test
with the normalized threshold values.The results reveal that when the α′-martensite content is less than 5% and also in
the range of 15%—24%, the SCC susceptibility of this material decreases with the increase of α′-martensite
content.However, when the α′-martensite content is in the rang of 5%—15% and more than 24%, the SCC susceptibility of
this material increases with the increase of the α′-martensite content.The SCC fracture surface of the specimens exhibits a
stepped fracture surface and transgranular stress corrosion fracture surface morphology.