不同含氮量Cr-Mn-Mo奥氏体不锈钢的理化性能  

Physical and Chemical Properties of Cr-Mn-Mo Austenitic Stainless Steel with Different Nitrogen Contents

作　　者：翁建寅[1,2] 彭伟 刘腾轼 陆恒昌 宁小智 鲍贤勇[2] 李北 董瀚[1,3] WENG Jianyin;PENG Wei;LIU Tengshi;LU Hengchang;NING Xiaozhi;BAO Xianyong;LI Bei;DONG Han(Central Iron and Steel Research Institute, Beijing 100081, China;Technology Center of FIYTA Precision Technology Co., Ltd., Shenzhen Guangdong 518057, China;School of Materials Science and Engineering, Shanghai University,Shanghai 200444, China)

机构地区：[1]钢铁研究总院,北京100081 [2]飞亚达精密科技股份有限公司,广东深圳518057 [3]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2020年第4期83-87,共5页Shanghai Metals

基　　金：中国博士后基金(No.2019M651465)。

摘　　要：为揭示氮及其含量对Cr-Mn-Mo奥氏体不锈钢物理和化学性能的影响,冶炼了以18Cr14Mn3Mo钢成分为基础的不含氮和含0.42%、0.59%及0.77%N(质量分数)的试验用钢。钢锭锻造后进行了1100℃×1 h水冷固溶处理。检测了4种钢的平均线膨胀系数、导热系数、比热容、自腐蚀电位和耐晶间腐蚀性能。结果表明:不含氮的钢的平均线膨胀系数远小于含氮钢的,不同含氮量的钢的线膨胀系数无明显变化;钢的导热系数随着含氮量的升高而减小,含氮量(ω(N))与导热系数(λ)的关系式为λ=17.23-6.72ω(N);不含氮的钢的比热容为0.466 J/(g·K),含0.42%N钢的为0.479 J/(g·K),含0.77%N钢的为0.446 J/(g·K);不含氮的钢的自腐蚀电位小于含氮钢的,为-0.175 V,不同含氮量的钢的自腐蚀电位差别不大,含0.59%N钢的耐晶间腐蚀性能最佳。Steels for test based on the composition of 18Cr14Mn3Mo steel,containing 0,0.42%,0.59%,and 0.77%N by mass,were smelted to identify the effect of nitrogen and its content on physical and chemical properties of Cr-Mn-Mo austenitic stainless steel.The steel ingots were forged and then solution treated by soaking at 1100℃for 1 h and cooled in water.The steels were tested for average linear expansion coefficient,thermal conductivity,specific heat,self-corrosion potential,and resistance to intergranular corrosion.The results were that:(a)average linear expansion coefficient of the nitrogen-free steel was much less than those of the steels containing nitrogen,and the steels with different nitrogen contents varied little in linear expansion coefficient;(b)thermal conductivity of the steels reduced with the increase in nitrogen content,and the relation of nitrogen content(ω(N))to thermal conductivity(λ)was expressed asλ=17.23-6.72ω(N);(c)specific heats were 0.466 J/(g·K)for the nitrogen-free steel,0.479 J/(g·K)for the steel containing 0.42%N,and 0.446 J/(g·K)for the steel containing 0.77%N;and(d)self-corrosion potential of the nitrogen-free steel was-0.175 V which was less than those of the nitrogen-containing steels,the steels with different nitrogen contents had no evident difference in self corrosion potential,and the steel with 0.59%N was the most resistant to intergranular corrosion of the three nitrogen-containing steels.

关 键 词：不锈钢 含氮量 物理性能 化学性能 晶间腐蚀 

分 类 号：TG1[金属学及工艺—金属学]