在实验室条件下研究了Ti-6Al-4V合金热盐应力腐蚀。实验表明在300—420℃温度范围内静态热盐应力腐蚀临界应力低于同温度的蠕变强度。实验还表明,经热盐应力暴露后试样的塑性对形变速度很敏感。用离子探针分析断口微区氢浓度的结果表明,氢在试样表面和断口处有明显的富集,因而可以认为钛合金热盐应力腐蚀的脆化是通过盐对试样的腐蚀而生成的氢所引起的。
Experiments were carried out on the hot salt stress corrosion cracking (HSSCC) of titanium alloy Ti-6Al-4V. The steady-state threshold stress for HSSCC in the temperature range of 300—420℃ was found to be lower than their creep strength at the same temperature. The post-exposure ductility of the specimens after HSSCC is susceptible to the strain rate. By ion microproble analysis, results show that hydrogen is markedly concentrated along the fractographic surface. It seems that the hydrogen produced halide salt corrosion and subsequently absorbed by the titanium alloy is responsible for cracking.
参考文献
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