工艺参数对WC颗粒增强表层复合材料与钢基界面组织的影响  

Effect of process parameters on interfacial microstructure of WC particle reinforced surface composite and steel substrate

作　　者：张展展 宁家庆 左玲立 廖海洋 Zhang Zhanzhan;Ning Jiaqing;Zuo Lingli;Liao Haiyang(School of Mechanical Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China;Beijing National Innovation Institute of Lightweight Ltd.,China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100083,China)

机构地区：[1]湖南工业大学机械工程学院,湖南株洲412007 [2]中国机械科学研究总院集团有限公司北京机科国创轻量化科学研究院有限公司,北京100083

出　　处：《金属热处理》2021年第11期131-136,共6页Heat Treatment of Metals

基　　金：湖南省教育厅科学研究项目(18C0485);湖南省自然科学基金(2019JJ50116)。

摘　　要：以45钢为基材,通过放电等离子烧结和铸造工艺成功制备了WC颗粒增强表层复合材料,研究不同浇铸工艺参数对表层WC/Fe复合材料与基材之间的界面结合及微观组织的影响。结果表明:随着浇铸量的增加,锭模的数值模拟温度可达1493℃,高温停留时间约734 s,为实现钢液与WC/Fe复合材料冶金结合提供有利条件,但是过高的浇铸量使WC/Fe复合材料的组织发生明显的变化,几乎观察不到WC增强相,组织出现大量鱼骨状碳化物Fe_(3)W_(3)C。当浇铸量控制在锭模体积的2/5时,可得到良好的WC/Fe复合材料与基材的宏观界面,界面反应产物Fe_(3)W_(3)C增加,但是增强颗粒仍保留了浇铸前的原始形貌。WC particle reinforced surface composite was prepared on 45 steel as substrate material by spark plasma sintering and then casting process.The effects of various casting process parameters on the interface bonding and microstructure between the WC/Fe composite and the steel substrate were studied.The results show that when the casting amount increases,the numerical simulation ingot mold temperature may reach 1493℃,and the high temperature residence duration is about 734 s,providing favorable conditions for realizing the metallurgical bonding of molten steel and WC/Fe composite material.However,due to the large casting quantity,the microstructure of the WC/Fe composite material changes noticeably,and the WC strengthened phase is hardly observed,while a lot of fishbone carbide Fe_(3)W_(3)C appears in the microstructure.When the casting quantity is set to 2/5 of the mold volume,a good macroscopic interface between the WC/Fe composite and the steel substrate is formed,and the interface reaction product Fe_(3)W_(3)C increases,but the original morphology of the reinforced particles is still preserved.

关 键 词：WC/Fe表层复合材料 45钢 界面组织 铸造 数值模拟 

分 类 号：TG174.4[金属学及工艺—金属表面处理]