Ti-6321钛合金棒材热变形及热处理工艺  

Heat Deformation and Heat Treatment Process of Ti-6321 Alloy Bars

作　　者：陈海生[1,2] 罗锦华[2] 王文盛[2] 孙小平[2] 刘向宏[1,2] 冯勇[1,2] 张平祥[1,2] 傅恒志[1] Chen Haisheng Luo Jinhua Wang Wensheng Sun Xiaoping Liu Xianghong Feng Yong Zhang Pingxiang Fu Hengzhi(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi＇an 710072, China Western Superconducting Technologies Co., Ltd, Xi＇an 710018, China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]西部超导材料科技股份有限公司,陕西西安710018

出　　处：《稀有金属材料与工程》2016年第11期2948-2952,共5页Rare Metal Materials and Engineering

基　　金：国家国际科技合作专项(2013DFB50180);陕西省科技统筹创新工程计划项目(2015KTTSG01-08)

摘　　要：对Ti-6321钛合金棒坯在两相区进行加热,再经过50%~80%的精锻热变形和普通退火后,发现原始棒坯的组织类型并没有发生改变,但α相组织的拉长特征得到明显改善。随着变形量增大,晶粒细化程度逐步提高,棒材强度呈上升趋势,冲击韧性呈下降趋势。对Φ45 mm规格棒材进行了普通退火、双重退火、β退火和固溶时效热处理实验。结果表明,Ti-6321合金棒材的组织和性能对热处理工艺较为敏感,应根据使用环境的具体要求,选择适宜的热处理工艺,最终实现材料强度、塑性和韧性的良好匹配。Ti-6321 titanium alloy billets were heated in the（α＋β） phase region, forged in the deformation range of 50%~80% and underwent conventional annealing. Then we can find that the microstructure types of original billets are not changed, but the elongated α phase structure is crushed obviously. With the increasing of deformation, the degree of grain refinement is improved gradually, the strength of bars increases and the impact toughness of bars decreases. The bars with 45 mm in diameter were heat treated by conventional annealing, dual annealing, β annealing, and solution annealing and aging. The result shows that the microstructure and properties of Ti-6321 alloy bars are sensitive to the heat treatment process. Therefore, we should select the optimum heat treatment method to achieve an appropriate combination of strength, plasticity and toughness according to the special requirements.

关 键 词：Ti-6321钛合金 变形量 热处理 显微组织 性能 

分 类 号：TG319[金属学及工艺—金属压力加工] TG166.5