(山東科技大學(xué) 材料科學(xué)與工程系，泰安 271019)
摘 要: 用常壓弧光等離子體在45#鋼表面熔覆Fe-Cr-Si-B粉末涂層，采用電子探針、透射電鏡、X射線衍射儀及顯微硬度計(jì)對(duì)熔覆層的成分、組織、結(jié)構(gòu)及性能進(jìn)行了分析。結(jié)果表明：熔覆層由A(Me)+F(Me)+Me23C6等組成，且A與Me23C6保持共格關(guān)系，F(xiàn)與Me23C6保持位向平行關(guān)系；熔覆層中B、C、Fe成分分布較均勻，Ce存在明顯的波峰，表明有Ce存在；Cr存在界面“梯度擴(kuò)散層”；顯微硬度在HV0.05700左右。A、 F良好的強(qiáng)韌性，M23C6硬化及共格強(qiáng)化使得熔覆層性能優(yōu)良。
關(guān)鍵字: 等離子體； 顯微組織； 溶質(zhì)分布； 共格強(qiáng)化
Fe-Cr-Si-B Cladding by plasma
（Department of Materials Science and Engineering,
University of Science and Technology Shandong, Taian 271019, P.R.China）
Abstract:Fe-Cr-Si-B powder cladding is deposited, the composition, microstructure and microhardness of cladding were studied by means of electron probe, TEM, X-ray diffractometer and microhardness testers. The results shows that the cladding is mainly composed of A(Me), F(Me) and Me23C6; A(Me) and Me23C6 retain coherence relation; F(Me) and Me23C6 keep phase parallel. Compositions of B, C and Fe distribute more evenly, Ce exists sharp spikes， indicating existence of Ce. The microhardness is about HV0.05700, The good properties of cladding are due to strengthening and toughening of A(Me) and F(Me) hardening of Me23C6 and coherence strengthening.
Key words: plasma； microstructure； solute distribution； coherence strengthening
