通过低温(-70℃)拉伸制备不同铁磁相含量的1Cr18Ni9Ti不锈钢,采用慢应变速率方法(SSRT)研究其在含CI~-介质中的SCC敏感性,用SEM进行断口分析。结果表明:铁磁相含量小于5％和在16～25％范围内,SCC敏感性随铁磁相含量增大不断下降;铁磁相含量在5～16％及大于25％时,材料的SCC敏感性随铁磁相含量增加而增大。
The effect of deformation-induced martensite (ferrimagnetic phase) on stress corrosion cracking of 1Crl8Ni9Ti stainless steel was investigated. Low temperature (-70℃) elongation method was used to obtain specimens with various martensite contents. SSRT was applied to investigate SCC susceptibility. Fracture morphology was observed with SEM. The results showed that when the content of ferrimagnetic phase was less than 5% or in the range of 16-25%, the SCC susceptibility of the material decresed with the increasing ferrimagnetic phase content. However, when the content of ferrimagnetic phase was in the range of 5-16% or more than 25%, its SCC susceptibility increased with the increasing ferrimagnetic phase content.
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