等离子喷焊合金层组织及性能试验研究

Experimental Study on the Property and Microstructure of the Alloy Overlay of Plasma Spray Welding

对16Mn钢表面等离子喷焊的自熔性铁基合金喷焊层(Fe55)和镍基合金喷焊层(Ni60)进行了硬度、显微组织、X射线衍射分析及不同腐蚀介质下的耐磨性试验。结果表明,Fe55和Ni60合金喷焊层的显微组织均为γ固溶体基体上分布着多种复杂的化合物相,如Fe23(C,B)6、(Cr,Fe)7C3、Cr7C3、NiB等。在中性水中Fe55合金喷焊层的耐磨性优于Ni60合金;在酸碱腐蚀介质中则正好相反,但两种合金喷焊层耐磨性都有所降低,在酸性介质中降低更明显。

Microstructure, Xray diffraction, hardness and wear resistance were examined to two different spray welding overlays of ironbase and nickelbase selffluxing alloy powder on the 16Mn steel by plasma spray welding. Results showed that the microstructures of alloy spray welding overlays consisted of γ phase and some intermetal compounds, for example, Fe23(CB)6,(Cr, Fe)7C3,Cr7C3 and NiB etc. The wear resistance of Fe55 overlays was higher than Ni60 in water and lower than Ni60 in acid and alkaline media.