N含量对0Cr16Ni5Mo马氏体不锈钢力学性能和组织的影响
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摘要
研究了2种N元素含量分别为0. 008%和0. 051%(质量分数)、使用真空感应+电渣重熔工艺冶炼、经锻造成型的Φ260 mm0Cr16Ni5Mo马氏体不锈钢棒在组织和力学性能方面的差异。钢棒经相同的淬火、回火热处理后,测试其力学性能、微观组织、残留奥氏体、析出相种类及数量等的变化规律。结果表明:N含量0. 051%的不锈钢棒在同样的淬火温度下,晶粒长大的速度较慢,Cr_2N等第二相数量较多且稳定,经回火后其屈服强度较低而抗拉强度较高;冲击吸收能量及断面收缩率等塑韧性指标较低。本文对N含量不同引起力学性能差异的原因以及作用机理进行了一定的探讨,认为N的增加引起的残留奥氏体数量较多以及晶粒细化、Cr_2N在晶界的偏聚析出等发挥着主要作用。
The differences in microstructure and mechanical properties of 2 kinds of Φ260 mm 0Cr16Ni5Mo martensitic stainless steel rods with N content of 0. 008 % and 0. 051 % (mass fraction),respectively,and prepared by vacuum induction melting and electroslag remelting were studied. The steel bar was subjected to the same quenching and tempering heat treatment, and the mechanical properties,microstructure,retained austenite,precipitation type and quantity of the steel bar were measured. The results show that under the same quenching and tempering conditions,the grain growth rate of stainless steel bars with 0. 051 % N content is slower,the number of Cr_2N and other second phases is more and stable,the yield strength is lower and the tensile strength is higher after tempering,and the plastic toughness indexes such as impact absorbed energy and section shrinkage are lower. Based on the discussion on the cause and mechanism of the difference in mechanical properties caused by different N content,it is considered that the increase of retained austenite caused by the increase of N,the grain refinement and the segregation and precipitation of Cr_2N at grain boundaries play the major role.
The differences in microstructure and mechanical properties of 2 kinds of Φ260 mm 0Cr16Ni5Mo martensitic stainless steel rods with N content of 0. 008 % and 0. 051 % (mass fraction),respectively,and prepared by vacuum induction melting and electroslag remelting were studied. The steel bar was subjected to the same quenching and tempering heat treatment, and the mechanical properties,microstructure,retained austenite,precipitation type and quantity of the steel bar were measured. The results show that under the same quenching and tempering conditions,the grain growth rate of stainless steel bars with 0. 051 % N content is slower,the number of Cr_2N and other second phases is more and stable,the yield strength is lower and the tensile strength is higher after tempering,and the plastic toughness indexes such as impact absorbed energy and section shrinkage are lower. Based on the discussion on the cause and mechanism of the difference in mechanical properties caused by different N content,it is considered that the increase of retained austenite caused by the increase of N,the grain refinement and the segregation and precipitation of Cr_2N at grain boundaries play the major role.
引文
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[5]Jiang W,Zhao K Y,Ye D,et al.Effect of heat treatment on reversed austenite in Cr15 super martensitic stainless steel[J].Journal of Iron and Steel Research,International,2013,20(5):61-65.
[6]马小平.0Cr(13~16)Ni(4,5)Mo(1,2)系超级马氏体不锈钢微合金化理论与技术研究[D].沈阳:东北大学,2011.
[7]郑善举,杨卯生,张启富,等.氮元素对马氏体不锈钢组织和性能的影响[J].材料热处理学报,2017,38(1):100-105.Zheng Shanju,Yang Maosheng,Zhang Qifu,et al.Effect of nitrogen element on microstructure and properties of martensitic stainless steel[J].Transatctions of Materials and Heat Treatment,2017,38(1):100-105.
[8]张永军,胡伟涛,韩静涛.高氮马氏体不锈钢3Cr13N的耐腐蚀机理[J].材料热处理学报,2015,36(s1):37-40.Zhang Yongjun,Hu Weitao,Han Jingtao.Anti-corrosion mechanism of high-nitrogen martensitic stainless steel 3Cr13N[J].Transactions of Materials and Heat Treatment,2015,36(s1):37-40.
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[11]马小平,王立军,王园园,等.氮对马氏体不锈钢00Cr13Ni4Mo组织和性能的影响[J].材料热处理学报,2012,33(4):78-84.Ma Xiaoping,Wang Lijun,Wang Yuanyuan,et al.Effect of nitrogen on microstructure and properties of martensitic stainless steel00Cr13Ni4Mo[J].Transactions of Materials and Heat Treatment,2012,33(4):78-84.