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本文论述了GH49合金锻造叶片局部粗晶形成的主要原因是临界变形。临界变形粗晶形成的机理是原始晶粒的直接长大,临界变形区晶粒长大的最初驱动是晶界两侧的畸变能差。为消除临界变形粗晶,一方面可以通过控制变形条件尽可能缩小临界变形区的范围;另一方面,锻后立即趁热进行短时间的退火处理,减小临界变形区的畸变能差,以控制粗晶区晶粒尺寸,实际效果是令人满意的。
This paper discusses the main reason for the formation of local coarse grains in forged blades of GH49 alloy is the critical deformation. The mechanism of the formation of the critical deformation coarse grains is the direct growth of the original grains. The initial driving of grain growth in the critical deformation zone is the difference in the distortion energy on both sides of the grain boundary. To eliminate the critical deformation of coarse grain, on the one hand by controlling the deformation conditions as much as possible to narrow the scope of the critical deformation zone; the other hand, forging immediately after hot annealing for a short time to reduce the critical deformation zone of the distortion energy to Control the grain size of coarse grain, the actual effect is satisfactory.