稀土元素对2205双相不锈钢500℃离子渗氮动力学的影响  

Effect of rare earth elements on plasma nitriding kinetics of 2205 duplex stainless steel at 500℃

作　　者：盛文萍 由园[1,2] 王逸凡 王妍 许诗淼[1,2] 顾峰 王超会 程伟东[1] SHENG Wenping;YOU Yuan;WANG Yifan;WANG Yan;XU Shimiao;GU Feng;WANG Chaohui;CHENG Weidong(School of Materials Science and Engineering,Qiqihar University,Qiqihar 161006,China;Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials,Qiqihar University,Qiqihar 161006,China)

机构地区：[1]齐齐哈尔大学材料科学与工程学院,黑龙江齐齐哈尔161006 [2]齐齐哈尔大学黑龙江省聚合物基复合材料重点实验室,黑龙江齐齐哈尔161006

出　　处：《高师理科学刊》2024年第9期44-48,共5页Journal of Science of Teachers＇College and University

基　　金：国家自然科学基金项目(51401113);黑龙江省自然科学基金项目(E2016069);黑龙江省高校基本科研业务费项目(145209302)。

摘　　要：对2205双相不锈钢在NH3中500℃有无稀土等离子体渗氮动力学(8,16,24 h)进行了对比研究.含稀土(La)渗氮8 h时,有效硬化层(78.3μm)、化合物层(58.3μm)、扩散层(20.0μm)增厚率都是最高的,分别为33.8%,17.8%,122.2%.试样渗氮24 h后,表面硬度最高为1866.7 HV_(0.025),渗氮层最高硬度为1782 HV_(0.025),是芯部硬度(365 HV_(0.025))的4.9倍.稀土等离子体渗氮后,γ′-Fe_(4)N衍射峰变高,峰值变强,稀土的加入减少了ε-Fe_(2-3)N相的析出.相较于无稀土等离子体渗氮,加入稀土后的扩散系数K提高了22.8%,达到了1.51×10^(-13) m^(2)·s^(-1).A comparative study was conducted to examine the plasma nitriding kinetics of 2205 duplex stainless steel in NH3 with and without rare earths at 500℃(8,16,24 h).The effective hardening layer(78.3μm),compound layer(58.3μm),and diffusion layer(20.0μm)thickening rates at 8 hours of nitriding with rare earths(La)were all the highest,33.8%,17.8%,and 122.2%,respectively.The maximum surface hardness of the specimen after 24 hours of nitriding is 1866.7 HV_(0.025),and the maximum hardness of the nitrided layer is 1782 HV_(0.025),which is 4.9 times of the core hardness(365 HV_(0.025)).The γ′-Fe_(4)N diffraction peak becomes higher and stronger after plasma nitriding with rare earth,and the addition of rare earths reduces the precipitation of ε-Fe_(2-3)N phase.The diffusion coefficient K increased by 22.8% to 1.51×10^(-13) m^(2)·s^(-1) with the addition of rare earths compared to plasma nitriding without rare earth.

关 键 词：2205双相不锈钢 稀土等离子体渗氮 显微组织 动力学 

分 类 号：TG156.8[金属学及工艺—热处理]