灰口铸铁镍基等离子熔覆层组织和性能  

The Microstructure and Property of Ni-based Overlay Prepared by Plasma Overlaying on Grey Cast Iron

作　　者：吕耀辉[1] 徐滨士[1] 向永华[1] 刘存龙[1] 

机构地区：[1]装备再制造技术国防科技重点实验室装甲兵工程学院,北京100072

出　　处：《中国表面工程》2009年第1期46-48,55,共4页China Surface Engineering

基　　金：国家自然科学基金项目(50675223);装备再制造技术国防科技重点实验室基金(9140C85020206JS9105)

摘　　要：采用等离子弧粉末熔覆技术在磨损的灰口铸铁发动机缸体上制备了Ni基熔覆层。通过光学金相显微镜和扫描电镜观察分析了熔覆层显微组织和形貌,并利用维氏硬度计测试了熔覆层的显微硬度。试验测试结果表明:等离子弧粉末熔覆制备的熔覆层为奥氏体组织,没有出现灰口铸铁堆焊中经常产生的白口组织;熔覆层硬度与母材硬度相一致,达到了铸铁缸体尺寸修复层与母材硬度相近的要求。The Ni-based overlay was prepared by plasma cladding technique on the worn grey cast iron cylinder body. The microstructure and morphology were observed by metallography and SEM, the microhardness was tested by Vickers. It was showed that the microstructure of Ni-based deposited layer was austenitic structure, and there was no chill found. The hardness accorded with that of base metal, which met the repair requirement of cylinder body.

关 键 词：灰口铸铁 等离子弧熔覆 NI基合金 显微组织 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG113.25[金属学及工艺—金属学]