摘要
航空气瓶要求其制作材料抗拉强度在1 080~1 280 MPa之间,屈服强度≥1 010 MPa,延伸率≥10%,断面收缩率≥35%。采用两相区固溶＋时效和双重固溶＋时效两种工艺,对航空气瓶用的热挤压成形TC18钛合金管进行热处理,研究了热处理制度对材料显微组织和力学性能的影响,探讨了它们之间的影响规律。结果表明,采用固溶＋时效热处理获得弥散分布的针状α相,而双重固溶＋时效获得片层α相和等轴α相;随着时效温度的升高,两种工艺处理的组织中初生α相均明显减少。采用固溶＋时效和双重固溶＋时效热处理,合金的力学性均能满足航空气瓶对材料的要求。
The aviation gas cylinder raises higher demands for the strength and ductility of the material. Demand of tensile strength Rm is between 1 080 MPa to 1 280 MPa, yield strength Rr0.2 is over 1 010 MPa, elongation A is over 10%, reduction of area Z is over 35%. With the solution-aging treatment and double solution-aging treatment for hotextruded φ170 mm × 30 mm xL TC18 alloy aviation gas cylinder, the effects of heat treatment process on the micro- structure and mechanical properties of the material were studied in this paper, and the laws of influence were discussed. It is found that diffuse distribution of acicular α phase is obtained after solution-aging treatment, but equiaxed α phase is obtained after double solution-aging treatment. Primary α phase decrease significantly with the development of aging temperatures during both heat treatments. With the solution-aging treatment and double solution-aging treatment, strength and ductility of the alloy are both able to meet the operating requirements of the aviation gas cylinder.
出处
《钛工业进展》
北大核心
2015年第4期22-24,共3页
Titanium Industry Progress
