氢对钛合金组织及加工性能的影响

Effects of Hydrogen on Process and Microstructure and Properties of Titanium Alloys

分析了氢对钛合金作用的两重性。一方面,氢引起钛合金氢脆、应力腐蚀及延迟断裂等危害;另一方面,采用热氢处理技术降低钛合金的高温流变应力,改善钛合金的热塑性。热氢处理技术是改善钛合金加工性能的一种有效的新方法,可以细化晶粒,改变相结构,改善钛合金的加工性能。归纳了热氢处理技术在钛合金加工、焊接及铸造中的应用。

Negative and positive effects of hydrogen on titanium and titanium alloys were reviewed in this paper. On one hand, harmful effects of hydrogen emhrittlement, stress corrosion, delayed fracture, etc. can be caused by the doping hydrogen into Ti and Ti alloys ; on the other hand, rheological stress for Ti alloys at elevated temperature decreases by hydrogen treatment process, as a result the thermal plasticity increases. Through thermal hydrogen treatment process, grains will be refined, phase structures will be changed, in a consequence, processability of Ti alloys will be improved. As one of new effective methods to improve the processability, application of thermal hydrogen treatment process for Ti alloys was summarized.