等离子弧粉末堆焊工艺参数对T800堆焊层组织及硬度的影响  

Effect of plasma powder surfacing parameters on Microstructure and hardness of T800 surfacing layer

作　　者：薛海涛[1] 王汉清[1] 靳伟[2] 陈翠欣[1] 董玮[1] 

机构地区：[1]河北工业大学,天津300130 [2]中国航天科技集团公司北京航天动力研究所,北京100000

出　　处：《焊接技术》2017年第3期6-8,共3页Welding Technology

摘　　要：T800钴基合金具有优异的高温耐磨耐蚀性能,在高温阀门密封面等工况严苛的工作场合具有广阔的应用前景。本文研究了等离子弧粉末堆焊转移弧电流对T800合金堆焊层组织以及硬度的影响。试验采用170,180,190,200 A这4种电流在310S不锈钢板上堆焊T800合金,并采用X射线衍射、扫描电镜(SEM)、金相显微镜对4种不同的T800合金堆焊层进行组成相以及组织形态的研究,采用洛氏硬度计、显微硬度计对堆焊层硬度进行测量。结果表明:堆焊层由αCo(fcc)和Laves(Co_3Mo_2Si)相组成;电流的增大不仅会减少合金层中的Laves相的含量,还会改变Laves相在组织中存在的状态;堆焊层硬度随电流的增大而减小。T800 cobalt based alloy had excellent high temperature wear resistance and corrosion resistance. It had wide application prospects in the harsh working occasions such as high temperature valve sealing surface and so on. In this paper, the effect of plasma arc welding current on the microstructure and hardness of T800 alloy surfacing layer was studied. Using 170, 180, 190, 200 A four kinds of current to surfacing T800 alloy on the 310 S stainless steel. By using X-ray diffraction, scanning electron microscopy( SEM) and optical microscope research composition phase and microstructure of four kinds of T800 alloy surfacing layer, and using hardness tester, micro hardness tester to text hardness. The results showed that the surfacing layer was composed of αCo(fcc) and Laves(Co_3Mo_2Si) phase; the increasing of current not only reduced the alloyed layer content of Laves phase, but changed the state of Laves phase;the hardness of surfacing layer decreased with increasing current.

关 键 词：钴基合金 等离子弧粉末堆焊 T800 LAVES相 硬度 

分 类 号：TG455[金属学及工艺—焊接]