锻压技术

固溶前预热对Ti6Al4V合金厚截面环锻件组织均匀性的影响

英文标题：Influence of preheating before solution on microstructure uniformity for Ti6Al4V alloy ring forgings with thick cross-section

作者：邹朝江郑腾腾张正王攀智

单位：贵州航宇科技发展股份有限公司

关键词：Ti6Al4V合金厚截面环锻件预热处理固溶组织均匀性

分类号：T156.1

出版年,卷(期):页码：2023,48(9):213-219

摘要：

针对截面厚度为100 mm以上的Ti6Al4V合金环轧锻件，开展了在650 ℃预热处理后再升温至960 ℃进行固溶处理和在设定温度960 ℃下装炉进行固溶处理的工艺试验。采用等效试块和负载热电偶监控Ti6Al4V合金厚截面环轧锻件热处理过程的温度变化和保温时间。从经不同热处理后的锻件的典型位置切取横截面试片观察宏观组织，然后分别从锻件内径、芯部和外径处切取试样观察显微组织和测试室温拉伸性能。对比分析了两种热处理工艺对环锻件组织均匀性和室温拉伸强度均匀性的影响。研究结果表明，固溶处理前先进行650 ℃预热处理的环锻件，其组织均匀性、室温拉伸强度均匀性均优于在设定温度960 ℃下装炉进行固溶处理的锻件。受合金淬透性限制，预热处理无法完全消除Ti6Al4V合金厚截面环锻件不同截面位置的组织和性能的差异。

For Ti6Al4V alloy ring-rolled forgings with a cross-section thickness of more than 100 mm, the process tests of preheating treatment at 650 ℃ and then rising to 960 ℃ for solution treatment and furnace charging at the set temperature of 960 ℃ for solution treatment were carried out, and equivalent test blocks and load thermocouple were used to monitor the temperature change and holding time during heat treatment of Ti6Al4V alloy ring-rolled forgings with thick cross-section. Then, the macrostructure of cross-section test pieces cut from the typical positions of forgings after different heat treatments were observed, and the specimens were cut from the inner diameter, core and outer diameter areas of forgings to observe microstructure and test tensile properties at room temperature. Furthermore, the influences of the two heat treatment processes on the microstructure uniformity and the tensile strength uniformity at room temperature of ring forgings were compared and analyzed. The research results show that the microstructure uniformity and the tensile strength uniformity at room temperature of the ring forgings preheated at 650 ℃ before solution treatment are better than those of the forgings furnaced at the set temperature of 960 ℃ for solution treatment. However, limited by the hardenability of alloy, the preheating treatment can not completely eliminate the differences in the microstructure and properties of Ti6Al4V alloy ring forgings with thick cross-section at different cross-sectional positions.

基金项目：

邹朝江(1984-)，男，学士，工程师 E-mail：zouchaojiang@gzhykj.net

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