形变诱发马氏体对1Cr18Ni9Ti不锈钢应力腐蚀破裂的影响  

THE EFFECT OF MARTENSITE INDUCED BY DEFORMATION ON STRESS CORROSION CRACKING OF 1Cr18Ni9Ti STAINLESS STEEL

作　　者：许淳淳[1] 欧阳维真[1] 姜宝文[2] 吴永炘[2] 

机构地区：[1]北京化工大学 [2]香港理工大学

出　　处：《腐蚀科学与防护技术》1996年第4期267-270,共4页Corrosion Science and Protection Technology

基　　金：国家自然科学基金;金属腐蚀与防护国家重点实验室资助项目;香港理工大学研究基金资助项目

摘　　要：通过低温（－７０℃）拉伸方法，制备出具有不同马氏体（铁磁相）含量的１Ｃｒ１８Ｎｉ９Ｔｉ（ＡＩＳＩ３２１）奥氏体不锈钢试件。采用恒载荷法对双边缺口试样进行应力腐蚀试验，测定了不同马氏体含量的试样在氯化物介质中应力腐蚀破裂（ＳＣＣ）的归一化门槛值。用ＳＥＭ观察断口形貌。结果表明：当铁磁相含量小于５％时，材料的ＳＣＣ敏感性随含量增加而减小；在５～１５％范围内，ＳＣＣ敏感性不断增加；在１５～２４％区域中，材料的ＳＣＣ敏感性迅速下降；超过２４％，ＳＣＣ敏感性又有所上升。Different degrees of tensile deformation were respectively applied to 1Cr18Ni9Ti stainless steel plates to obtain the steel samples with various contents of α' martensite (ferrimagnetic phase). The relationship between martensite content and SCC behavior of steel in 42% MgCl 2 (boiling) solution was studied by constant load testing. The normalized threshold (K ISCC /K c) was employed to evaluate the influence of α' martensite content on SCC susceptibility. The results reveal that when the content of ferrimagnetic phase is less than 5% and in the range between 15% and 24%, the SCC susceptibility of this material decreases with increasing ferrimagnetic phase content. However, when the content of ferrimagnetic phase is in the range between 5%～15% and more than 24%, its SCC susceptibility increases with increasing ferrimagnetic phase content. The scanning electron fractographs show a transgranular SCC feature.

关 键 词：α'-马氏体 铁磁相 应力腐蚀敏感性 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG172.9[金属学及工艺—金属材料]