氮元素对Cr13超级马氏体不锈钢组织及性能的影响  

Effect of nitrogen on microstructure and properties of Cr13 super martensitic stainless steel

作　　者：南海[1] 常瑞津 李静媛[2] 徐芳泓[1] 张威[1] NAN Hai;CHANG Rui-jin;LI Jing-yuan;XU Fang-hong;ZHANG Wei(State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron and Steel(Group)Co.,Ltd.,Taiyuan 030003,Shanxi,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,山西太原030003 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《钢铁研究学报》2020年第12期1148-1156,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(U1806220);山西省科技重大专项资助项目(20191102006)。

摘　　要：为了提高超级马氏体不锈钢的性能以满足油气开采的使用要求,在Cr13超级马氏体不锈钢中添加质量分数为0.065%的N元素,并采用金相观察、SEM、拉伸试验、电化学测试等方法,研究N元素对Cr13超级马氏体不锈钢组织、力学性能及耐蚀性能的影响。研究发现,N元素能细化原奥氏体晶粒、对组织中的回火马氏体有一定的"短化"作用,并且能有效减少组织中的δ铁素体、增加奥氏体的含量。在力学性能方面,适量的N元素因可以细化奥氏体晶粒和短化马氏体从而增加晶界和亚晶界,所以能有效提高试验钢的屈服强度和抗拉强度。耐蚀性能方面,电化学实验表明,适量的N元素能提高钝化膜的保护能力和再钝化能力,所以在一定程度上能有效提高试验钢的耐蚀性能。The effects of 0.065 wt.% N element addition on microstructures, mechanical properties and corrosion properties of the Cr13 super martensitic stainless steel have been investigated by microstructural observation, SEM, tensile tests and electrochemical tests, in order to improve the properties of super martensitic stainless steel to meet the requirements of oil and gas exploitation. Experimental results indicated that the addition of N element significantly reduced the content of ferrite as well as increased the content of austenite. Meanwhile, proper addition of N element has obvious impact on refining the original austenite grain and shortening the tempered martensite, which can effectively improve the yield strength and tensile strength of tested steel due to the increase in grain boundaries and sub-grain boundaries. As for the corrosion resistance, it was revealed from electrochemical experiments that proper amount of N element can enhance the protection and repassivation performance of passivation film, which consequently improved the corrosion resistance of test steel to a certain extent.

关 键 词：超级马氏体不锈钢 氮元素 力学性能 耐蚀性能 

分 类 号：TG142.71[一般工业技术—材料科学与工程]