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研究了α+β两相区变形坯料不同部位产生锻造温升时,TC21合金的微观组织演变过程及拉伸性能的变化规律。结果表明,随着锻造温升增加,细小的等轴α相被周围β相吞并转变为短棒状;相距较近的短棒状α相进一步相互合并生成弯曲的条状α相。由于坯料心部锻造温升动态回复进行得很充分,晶粒被充分拉长。最后,微观组织转变成网篮组织。具有网篮组织的合金拉伸强度急剧下降,随着其比例的增加,合金的拉伸强度继续降低,直到组织均为网篮组织时达到最低。
The microstructure evolution and tensile properties of TC21 alloy were studied at different temperatures of forging deformation in α + β two-phase region. The results show that the fine equiaxed α phase is swallowed by the surrounding β phase and transformed into a short rod shape as the forging temperature increases. The shorter short rod α phases are further combined to form a curved strip α phase. Due to the blank heart forging temperature dynamic response is fully carried out, the grain is fully elongated. Finally, the microstructure turns into a basket organization. Tensile strength of the alloy with the basket decreased sharply, with the increase of its proportion, the tensile strength of the alloy continued to decrease until it reaches the lowest when all the tissues are baskets.