钛合金β区加热保温时间的研究

Study on Holding Time of β Zone Heating of Titanium Alloy

利用DEFORM软件详细模拟了钛合金坯料在不同加热方式下的升温过程,并通过热处理工艺实验研究了β区保温时间对TC18钛合金拉伸性能的影响。模拟结果表明采用分段加热方式可大大缩短钛合金坯料在β区的保温时间,规格越大时间缩短得越明显;两相区预热温度对β区保温时间也有显著影响,预热温度从800℃提高到840℃,β区保温时间可缩短1/3～1/2。热处理实验结果表明,β区保温时间超过60m in时会引起TC18钛合金断面收缩率和伸长率大幅度降低。

Heating process of titanium alloy under different heating pattern was simulated by DEFORM software and the effect of holding time in beta phase on tensile property of TC18 titanium alloy was also studied through heat treatment test.Simulating results show holding time in beta phase is shortened obviously when heating by stage.Preheating temperature also has effect on holding time in beta phase.Holding time in beta phase is cut off 1/3~1/2 while preheating temperature raised from 800℃to 840℃.Heat treatment test results show that the ductility of TC18 titanium alloy reduces obviously when holding time in beta phase is over 60min.