摘要
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。
Effect of heat treatment on electrochemical corrosion behavior of Ni- base superalloy DZ125 laser recast layer in chemical milling solution was investigated in terms of characterizing the recast layer by means of electrochemical corrosion, scanning electron microscopy, as well as Xray diffraction of corrosion products and scanning corrosion surface. It was found that DZ125 alloy recast layer was mainly consisted of dendrite structure with less γ ’ phase precipitate. However,there were lots of γ ’ phases precipitating enough densely in recast layer after heat treatment. Heat treatment of the recast layer enhances its passivation. The as heat- treated samples were dissolved even slowly than those recast sample, as well as its corrosion tendency decreased. There fore, heat treatment can significantly improve corrosion resistance of laser recast layer in the chemical milling solution.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2016年第4期313-318,共6页
Corrosion Science and Protection Technology
基金
国家自然科学基金项目(51301182)资助
