Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第6期    总第171期    2013年6月

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文章编号:1004-0609(2013)06-1530-06
单级退火对BTi-6431S合金组织和力学性能的影响
张文婧1, 宋晓云1, 惠松骁1, 叶文君1, 王永玲1, 王小翔2, 王韦琪2

(1. 北京有色金属研究总院 有色金属材料制备与加工国家重点实验室,北京 100088;
2. 宝钛集团有限公司,宝鸡 721014
)

摘 要: 采用光学显微镜、电子探针和拉伸实验研究单重退火处理对BTi-6431S合金显微组织和力学性能的影响。结果表明:随退火温度的升高,合金中的初生α相粗化,趋于等轴状,体积分数逐渐降低;β相和次生α相的体积分数增加。随退火温度的升高,合金的室温强度先升高后降低,高温强度则逐渐升高;但是室温和高温塑性均不断下降。经过980 ℃退火处理后,BTi-6431S合金获得良好的高温强度和室温塑性匹配,此时合金650 ℃的抗拉强度达到600 MPa以上,室温伸长率超过8%。

 

关键字: 高温钛合金;BTi-6431S合金;单重退火;显微组织;力学性能

Effect of single annealing on microstructure and mechanical properties of BTi-6431S titanium alloy
ZHANG Wen-jing1, SONG Xiao-yun1, HUI Song-xiao1, YE Wen-jun1, WANG Yong-ling1, WANG Xiao-xiang2, WANG Wei-qi2

1. State Key Laboratory of Nonferrous Metals and Processes,
General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. Baoti Group Co., Ltd., Baoji 721014, China

Abstract:The effects of single annealing on the microstructure and mechanical properties of BTi-6431S titanium alloy were studied by OM, EPMA and tensile test. The results show that, with increasing annealing temperature, the primary α phase becomes coarse, then changes into equiaxed shape, and its volume fraction decreases gradually, while the volume fractions of β phase and secondary α phase increase. With elevating the annealing temperature, the room temperature strength increases at first and then decreases, while the high temperature strength increases gradually, but the room-temperature and high-temperature ductility decreases. After annealing at 980 ℃, BTi-6431S alloy acquires good strength at high-temperature and plasticity at room-temperature. The ultimate tensile strength at 650 ℃ can reach more than 600 MPa, and the room-temperature elongation is more than 8%.

 

Key words: high temperature titanium alloy; BTi-6431S alloy; single annealing; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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