Ni 基高温合金 Al-Si 涂层脆-塑性转变温度及其疲劳行为研究

INVESTIGATION ON THE BRITTLE DUCTILITY TRANSFORMATION TEMPERATURE AND FATIGUE BEHAVIOR OF Al Si COATING FOR NICKEL BASE SUPERALLOY

利用高温金相显微镜改进加载装置，在动态下测定了Ａｌ－Ｓｉ高温涂层的脆－塑性转变温度及其影响因素。研究结果表明，Ａｌ－Ｓｉ涂层的脆－塑性转变温度随着Ａｌ，Ｓｉ浓度的减少而降低，通过热处理的方法使涂层的Ａｌ，Ｓｉ浓度降低，可有效地降低涂层的显微硬度和脆－塑性转变温度。另处，还系统研究了涂层与基体在不同温度下断裂失效的模式及其机制。

High temperature microscope with loading equipment has been used and the brittle ductility transformation temperature of Al Si coating has been measured. Research results show that brittle ductility transformation temperature of Al Si coating decreases with decreasing of Al and Si contents. Al and Si contents can be decreased by heat treatment which induces obviously a decrease of microhardness and brittle ductility transformation temperature of coating. The fracture mode and mechanism for both nickel base superalloy and coating at different temperatures have been investigated in this paper.