B/N复合强化下Fe-Cr-Mn-Ni合金组织和性能的演变  

Evolution of Microstructure and Properties of Fe-Cr-Mn-Ni Alloy under B/N Composite Strengthening

作　　者：郭建波 刘政军[1] 苏允海[1] GUO Jianbo;LIU Zhengjun;SU Yunhai(Liaoning Advanced Welding Technology and Automation Laboratory,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学辽宁省先进焊接技术及自动化实验室,辽宁沈阳110870

出　　处：《热加工工艺》2025年第3期109-113,119,共6页Hot Working Technology

基　　金：国家重大专项项目(2017YFB1103603)。

摘　　要：为了研究B/N复合强化下Fe-Cr-Mn-Ni合金熔覆金属的组织性能演变,采用熔化极气体保护焊(GMAW)将不同氮含量的药芯焊丝熔覆在碳钢表面。对熔覆金属的硬度和耐磨性进行测试,并采用SEM和XRD等手段表征熔覆金属的磨损形貌和显微结构,分析含氮药芯焊丝的组织性能演变规律。结果表明,熔覆金属由γ基体和M_(2)B、BN、Cr(C,N)析出相组成,析出相呈网格状、鱼骨状。N元素的添加可以促进氮化物和硼化物的析出,并使其弥散分布,提高熔覆金属的综合力学性能,当N含量增加到1.0%时,熔覆金属的力学性能最佳,此时硬度为44 HRC,磨损量为0.0139 g,摩擦系数为0.33。随N含量增加,熔覆金属的磨损机制从磨料磨损向黏着磨损转变。随着磨损温度的升高,熔覆层的耐磨性呈下降趋势,磨损机制也从黏着磨损向磨料磨损转变。In order to study the evolution of the microstructure and properties of Fe-Cr-Mn-Ni alloy deposited metal under B/N composite strengthening,flux cored wires with different nitrogen contents were coated on the surface of carbon steel by gas metal-arc welding(GMAW).The hardness and wear resistance of the deposited metal were tested,the wear morphology and the microstructure of the surfacing metal were characterized by SEM and XRD,and the evolution of the microstructure and properties of nitrogen-containing flux cored wire were analyzed.The results show that the deposited metal consists of matrixγand precipitates M_(2)B,BN,Cr(C,N),and the shape of precipitates are grid and fishbone.The addition of N element can promote the precipitation of nitride and boride,and make them disperse and improve the comprehensive mechanical properties of the surfacing metal.When the content of N increases to 1.0%,the mechanical properties of the deposited metal are the best.At this time,the hardness is 44 HRC,the wear amount is 0.0139 g,and the friction coefficient is 0.33.With the increase of N content,the wear mechanism of the surfacing metal changes from abrasive wear to adhesive wear.With the increase of wear temperature,the wear resistance of cladding layer decreases,and the wear mechanism changes from adhesive wear to abrasive wear.

关 键 词：熔覆金属 硼氮复合强化 显微组织 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]