本文测定了TC11钛合金在350—500℃范围内的热盐应力腐蚀临界应力及五种不同表面状态对热盐应力腐蚀的影响。结果表明在试验温度范围内存在热盐应力腐蚀敏感性。通过不同表面状态的对比实验,证实表面阳极氧化处理能有效地提高钛合金的热盐应力腐蚀性能。氧化膜起了减缓有害物质向金属基体扩散的作用,适当地增加膜的厚度有利于提高抗热盐应力腐蚀性能。同时从表面喷丸试样的研究中表明,表面压应力的存在也能够改善抗热盐应力腐蚀性能,在430℃以下效果较为显著,但是,随着温度的增加这种有益的影响将会逐渐消失。
The evaluation of the threshold stress of hot salt stress corrosion cracking (HSSCC) of Ti alloy TC11 in temperature range from 350 to 500℃ under laboratory condition and of its susceptibility influenced by five different surface conditions was made. In comparison among them, it was believed that the susceptibility of Ti alloy TC11 to HSSCC may be effectively improved by anodizing its surface owing to retarding the aggressive materials diffused through the oxide layer into substrate. The surface treatment of shot peening may also improve the resistance to HSSCC, especially, at temperature below 430℃. However, no more improvement over its surface resistance by the compressive stress is noticed in increasing temperature.
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