等温变形0Cr14Mn21NiN无磁不锈钢的晶间腐蚀敏感性  

Intergranular corrosion susceptibility of isothermally deformed 0Cr14Mn21NiN non-magnetic stainless steel

作　　者：屈华鹏[1] 王利伟 冯翰秋 彭声通 陈海涛[1] 罗定祥 郎宇平[1] Qu Huapeng;Wang Liwei;Feng Hanqiu;Peng Shengtong;Chen Haitao;Luo Dingxiang;Lang Yuping(Institute of Special Steel,Central Iron and Steel Research Institute,Beijing 100081,China;Pangang Group Jiangyou Changcheng Special Steel Co.,Ltd.,Jiangyou Sichuan 621702,China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]攀钢集团江油长城特殊钢股份有限公司,四川江油621702

出　　处：《金属热处理》2020年第8期1-6,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2016YFB0300202)。

摘　　要：通过Thermal-Calc热力学软件对0Cr14Mn21NiN无磁不锈钢中碳化物析出的平衡相区进行了计算,并通过时效处理试验进行了验证。通过不同参数的等温变形试验对实际的非平衡态碳化物析出行为进行了研究。通过双环电化学动电位再活化法(DLEPR)对等温变形试样的晶间腐蚀敏感性进行了测试和对比。结果表明:热力学计算的平衡态Cr23C6碳化物析出温度范围为512847℃,而通过时效试验验证的实际析出温度范围为720940℃,表明二者之间存在约200℃的误差。当总变形量不超过20%时,等温变形非平衡态Cr23C6碳化物析出下限温度进一步降低至625℃,等温变形过程对晶界Cr23C6碳化物形核和长大过程均有加速作用。DL-EPR电化学方法结果表明等温变形后由于碳化物析出速度的加快,0Cr14Mn21NiN无磁不锈钢的晶间腐蚀敏感性显著增加。The equilibrium phase regions of carbide precipitation in the 0 Cr14 Mn21 NiN non-magnetic stainless steel( NMSS) were calculated by Thermal-Calc software,and the result was verified by aging treatment experiment.The real non-equilibrium carbide precipitation behavior was researched after isothermal deformation( ITD) experiment with different parameters.The intergranular corrosion( IGC) susceptibility of ITD specimens was tested and compared by double loop electrochemical potential-dynamic reactivation( DL-EPR) method.The results show that the Thermal-Calc calculated equilibrium Cr23C6 precipitation temperature region is from 512 ℃ to 847 ℃,while the real region obtained from the aging experiment is from 720 ℃ to 940 ℃,indicating a distinction of approximately 200 ℃.When the total deformation is less than20%,the lower temperature limit of non-equilibrium carbide precipitation of ITD specimens is descended to 625 ℃,and both the carbide nucleation and growth are accelerated after the ITD process.The DL-EPR results show that the IGC susceptibility of the 0 Cr14 Mn21 NiN nonmagnetic stainless steel is obviously increased after the ITD process due to the accelerated carbide precipitation.

关 键 词：无磁不锈钢 等温变形 晶间腐蚀 碳化物 

分 类 号：TG156.2[金属学及工艺—热处理]