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在350～500℃范围内研究了Ti-679合金的热盐应力腐蚀性能。实验表明合金的显微组织对热盐应力腐蚀的敏感性有很大的影响,在相同的热暴露条件下α+β相区热处理试样的临界应力比β相区热处理的要高。试验结果也表明,表面存在压应力的试样的临界应力高于无压应力者。用离子探针对断口表而进行的测定显示出在裂纹中有氢的大量富集,这表明钛合金在受热盐应力腐蚀过程中所产生的并随后被吸收的氢是开裂的主要原因。
The hot salt stress corrosion resistance of Ti-679 alloy was studied in the range of 350 ~ 500 ℃. Experiments show that the microstructure of alloy has a great influence on the sensitivity of thermal stress corrosion. The critical stress of thermal treatment in α + β phase is higher than that of β-phase in the same thermal exposure. The test results also show that the specimen with compressive stress on the surface has a higher critical stress than the specimen without compressive stress. The measurement of the fracture surface by the ion probe showed a large enrichment of hydrogen in the crack, indicating that the hydrogen produced by the titanium alloy during the salt stress corrosion and subsequently absorbed is the main cause of cracking.