摘要
在铁基合金粉末中加入一定量的铬铁和不同量的碳化钨,采取火焰喷涂在Q235钢表面制备3种复合粉末喷涂层,然后对其进行氩弧重熔,用光学显微镜对重熔层显微组织进行观察,测定重熔层的硬度和耐磨性。结果表明,铁基合金粉末重熔层与基体形成了良好的冶金结合,熔化区的组织从表面到靠近结合区依次为细小的树枝晶,大小均匀的等轴晶,粗大的树枝晶。结合区比较光亮狭小,以平面晶生长。热影响区为粗大的魏氏体组织。在CrFe加入量为9wt%的情况下,重熔层表面硬度随WC含量的的增加先增加后减小,WC加入量为15wt%时,洛氏硬度达到最大值64.4 HRC,耐磨性最好。
A certain amount of chromium iron and different amount of WC were added in iron base alloy powder , and three kinds of composite powder spray coating were prepared on Q 235 steel surface by flame spraying , then argon arc remelted .Microstructure of the remelted layer was observed by optical microscope , hardness and wear resistance were tested .The results show that the iron base alloy powder remelted layer is well metallurgical bonded with matrix .The melting zone microstructure from the surface to near binding region is fine dendrite , the uniform equiaxed grain and coarse dendrite in turn .Binding region is narrow and bright with planar crystal growing .Heat affected zone is coarse widmanstatten structure .In the case of 9wt% CrFe adding amount, with WC content increasing, remelted layer surface hardness increases first and then decreases .When WC addition amount is 15wt%, the hardness reaches to the maximum of 64.4 HRC, and the wear resistance is best .
出处
《金属热处理》
CAS
CSCD
北大核心
2014年第6期29-31,共3页
Heat Treatment of Metals
关键词
氩弧重熔
铁基合金粉末
重熔层
组织与性能
argon arc remelting
iron based alloy powder
remelted layer
microstructure and properties
