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z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0619-05
热轧温度对Ti-45Nb合金棒材微观组织及力学性能的影响
朱宝辉,王培军,刘彦昌,陈睿博,赵洪章,王晓平,郑爱国

(宁夏东方钽业股份有限公司 钛材分公司,石嘴山 753000)

摘 要: 对Ti-45Nb钛合金精锻棒材分别在750、800和850 ℃下进行热轧实验,并利用光学显微镜对试样的横向和纵向组织进行观察,对合金的室温强度和塑性指标进行测试。结果表明:在800 ℃温度下热轧时,合金均具有优良的室温强度和塑性,室温强度在420 MPa以上,室温塑性大于25%,显微组织为动态再结晶的细小等轴组织,且随着轧制温度升高,抗拉强度和塑性在800 ℃轧制时同时增高,在850 ℃时又同时降低。通过对成品丝材的组织和性能对比分析可知,750和800 ℃轧制的棒材加工到丝材,性能均满足标准要求,Ti-45Nb合金的最佳热轧温度可以确定为750~800 ℃。

 

关键字: Ti-45Nb;钛合金;热轧温度;棒材;显微组织;力学性能

Influence of rolling temperature on microstructure and mechanical properties of Ti-45Nb alloy bars
ZHU Bao-hui, WANG Pei-jun, LIU Yan-chang, CHEN Rui-bo, ZHAO Hong-zhang, WANG Xiao-ping, ZHENG Ai-guo

Titanium Product Plant, Ningxia Orient Tantalum Industry Co. Ltd, Shizuishan 753000, China

Abstract:The titanium alloy forging bars was hot-rolled at 750, 800 and 850 ℃, respectively, the sample longitudinal and horizontal microstructure were observed using an optical microscope, the strength and plasticity of the alloy was tested at room temperature. The results show that hot-rolled alloys under 800 ℃ have excellent strength and ductility at room temperature, the strength at room temperature is over 420 MPa, ductility at room temperature is over 25%, the microstructure consists of fine equiaxed dynamic recrystallization grains. With the rolling temperature rising, the tensile strength and ductility of the bars rolled at 800 ℃ increase, the tensile strength and ductility of the bars rolled at 850 ℃ decrease. Comparative analysis of microstructure and properties of wires, the mechanical properties of the wires made of the bars rolled at 750 ℃ and 800 ℃ can meet the standards. It can be determined that Ti-45Nb alloy optimum hot rolling temperature is 750~800 ℃.

 

Key words: Ti-45Nb; titanium alloy; rolling temperature; bar; 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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