摘要
本文研究了AlloyC+阻燃钛合金棒材在单重固溶、固溶+时效和高温固溶+低温固溶+时效等不同热处理状态下及高温长时热暴露后的显微组织。研究结果表明:AlloyC+钛合金轧制棒材原始显微组织为典型的等轴β晶粒,晶内有明显的第二相析出和孪晶生成;单重固溶时,固溶温度低时晶粒尺寸略小,固溶温度高时晶内析出相比例更高;双重和多重热处理并经长时热暴露后,由于α相有优先在晶界形核的趋势,因此在晶界的析出相增多,并在晶界形成了连续的粗化α相,从而破坏了晶界的连续性。
The microstructures of the Alloy C+with three different heat treatment processes have been investigated after exposure at 550℃ for 100 hours in this study. The alloy showed a typical equiaxed grains with second phase precipitation and twin formation inside grains at the as-rolled condition. Solution treatment at lower temperature led to a smaller grain size while higher temperature solution treatment produced coarse grains with increasing precipitated phases inside the β grains.Ageing treatment after solution and thermal exposure for a long period of time resulted in an increasing α phase precipitation at the grain boundary due to the priority tendency of nucleation of second phase. In a certain condition,continuous coarsening α phase is concentrated on the grain boundaries,therefore it violated the properties of the alloy.
出处
《中国钛业》
2014年第2期15-18,共4页
China Titanium Industry
