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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。
The thermal stress corrosion of Ti-6Al-4V alloy was studied under laboratory conditions. Experiments show that in the temperature range of 300-420 ℃, the critical stress of static thermal salt stress corrosion is lower than the same temperature creep strength. Experiments also show that the plasticity of specimens after exposure to salt stress is very sensitive to the deformation rate. The results of ion probe analysis of the hydrogen concentration in the fracture zone show that hydrogen is obviously enriched on the sample surface and the fracture surface. Therefore, it can be considered that the embrittlement of the salt alloy stress corrosion is generated by salt corrosion of the sample Of hydrogen caused by.