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通过再铸层微观结构分析、电化学腐蚀行为测试、腐蚀产物X射线衍射分析以及腐蚀表面的扫描电镜观察等分析手段,研究了热处理对镍基高温合金DZ125激光再铸层在化学研磨溶液中腐蚀行为的影响。结果表明:DZ125合金再铸层主要为枝晶结构,且强化相γ’相析出较少,热处理后再铸层中γ’相析出致密均匀。激光再铸层经热处理后,致密的γ’相增强了再铸层钝化保护能力,并且腐蚀速率明显小于再铸层,腐蚀倾向减小,因而热处理能显著提高激光再铸层在化学研磨溶液中的耐蚀性能。
The microstructure of recast layer, electrochemical corrosion behavior test, X-ray diffraction analysis of corrosion products and scanning electron microscope observation of corrosion surface were used to study the effects of heat treatment on corrosion resistance of DZ125 laser recast layer of Ni-based superalloy in chemical milling solution The impact of behavior. The results show that the recrystallization layer of DZ125 alloy is mainly dendritic structure, and precipitation of γ ’phase in the strengthening phase is less. After heat treatment, the γ’ phase precipitates densely and uniformly. The laser recast layer heat treatment, dense γ ’phase enhanced recasting layer passivation protection, and the corrosion rate was significantly smaller than the recast layer, the corrosion tendency decreases, so the heat treatment can significantly improve the laser recast layer in the chemical milling solution In the corrosion resistance.