摘要
借助光学显微镜、扫描电镜观察Nb,Mo在金相组织中存在的形态,研究了两元素强化机理,分析了硬度和耐磨性存在差异的原因.结果表明,在金相组织中,随Nb,Mo含量的增多,Nb,Mo的初生碳化物数量增多,熔敷金属硬度和耐磨性均增加;在堆焊熔敷金属中,Nb仅生成初生NbC,沉淀强化熔敷金属,强化效果明显,Mo不仅生成初生Mo2C,而且还固溶强化初生Cr7C3和基体,通过沉淀和固溶两种形式强化熔敷金属,但强化效果不明显.在高铬铸铁中为得到良好的耐磨性及经济效益须优化合金成分,应同步强化基体和碳化物.
The paper studied the microstructures morphology, and the discrimination in hardness and wearability of welded metal with the addition of Nb,Mo by optical microscope and SEM. The results showed that the number of primary carbide, macrohardness and wearability were increased with the increasing the contents of Nb, Mo. Nb only resulted in NbC to strength welded metal, and but this strengthen was better;Mo not only resulted in Mo2C but also in the primary carbide and matrix, but this strengthen was weaker than...
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第1期81-84,117,共5页
Transactions of The China Welding Institution
关键词
初生碳化物
强化
基体
耐磨性
primary carbide
strengthen
matrix
wearability
