BT22钛合金大尺寸锻棒固溶降温过程的组织演变

Microstructure Evolution during Solution Treatment Cooling Process of BT22 Alloy Large-Sized Forged Rods

摘要:

实测BT22钛合金Φ170 mm×200 mm锻棒固溶降温过程内部不同部位，芯部、1/2R、边部降温特性曲线。结果发现，由于相变作用875 ℃固溶降温曲线有1个缓慢降温阶段，在降温曲线中出现1个近似平台。并且3个部位降温具有很大的不同步性。同时研究875和810 ℃固溶降温过程中的组织演变规律。通过硬度测试发现中规格锻棒热处理后内部力学性能不均匀。

Abstract:

The cooling characteristic curves of the center, 1/2R and the border of the BT22 forged bars were measured. Results show there is a slow cooling stage in the 875 oC solution treatment cooling curve, due to the phase transformation. The curve exhibits one approximation flatform. The three positions have a big nonsynchronous characteristic of cooling. At the same time, microstructure development during the solution treatment cooling process at 875 and 810 oC was researched. According to the hardness test, non-uniform mechanical property of the medium forged bar after heat treatment was found.