热处理对TC21钛合金显微组织的影响（英文）

发布时间：2018-11-05 13:06

【摘要】：对TC21钛合金进行双重固溶+时效热处理,研究固溶冷却速率、温度对合金显微组织的影响。研究表明,初生α相形貌主要受一次高温固溶温度控制,高温固溶冷却速率对次生α相含量及长宽比有显著的影响。高的固溶冷却速率可以保留更多的亚稳定β相,从而在时效过程析出更多细小的次生α相,导致强度增加,塑性及韧性下降。二次低温固溶温度对合金后续的时效响应有显著的影响,高的固溶温度可以保留更多的β相,促使更多细小的转变α相在时效中析出;低的固溶热处理温度导致固溶残余β相含量减小,时效敏感性降低。时效过程导致残余β相的分解,特别是大块亚稳定β相区。
[Abstract]:The effect of solution cooling rate and temperature on microstructure of TC21 titanium alloy was studied by double solution aging heat treatment. The results show that the morphology of primary 伪 phase is mainly controlled by the primary solution temperature, and the cooling rate of high temperature solution has a significant effect on the content and aspect ratio of secondary 伪 phase. At high solid solution cooling rate, more metastable 尾 phases can be retained, thus more fine secondary 伪 phases are precipitated during aging, resulting in an increase in strength and a decrease in ductility and toughness. The secondary low temperature solution temperature has a significant effect on the subsequent aging response of the alloy. Higher solution temperature can retain more 尾 phases and promote the precipitation of more fine transition 伪 phases in the aging process. The content of residual 尾 phase decreases and the sensibility of aging decreases with low solution heat treatment temperature. The aging process results in the decomposition of residual 尾 phase, especially in the large metastable 尾 phase region.
【作者单位】：西北工业大学凝固技术国家重点实验室;西北有色金属研究院;
【基金】：National Natural Science Foundation of China(51471136,51001088) International Cooperation Project of China(015DF151430)
【分类号】：TG146.23;TG166.5

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