Effect of Microstructure on Stress Rupture Properties of Electron Beam Welds of Ti-24Al-15Nb-1.5Mo/TC11 Dual-alloy

被引：0

作者：

Qin Chun ^{[1
]}

Yao Zekun ^{[1
]}

Zhang Dongya ^{[1
]}

Ning Yongquan ^{[1
]}

Zhao Zhanglong ^{[1
]}

Guo Hongzhen ^{[1
]}

Cao Jingxia ^{[2
]}

机构：

[1] Northwestern Polytech Univ, Xian 710072, Peoples R China

[2] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2014年 / 43卷 / 04期

关键词：

dual alloy welding seam; stress rupture property; microhardness; ALPHA+BETA TITANIUM-ALLOY; HEAT-TREATMENT; JOINT; TEMPERATURE; TI2ALNB/TC11; BEHAVIOR;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of microstructures obtained by different heat treatments on the stress rupture properties of Ti-24Al-15Nb-1.5Mo/TC11 dual-alloy with electron beam welds has been evaluated. The results indicate that after double heat treatment, the microstructures of the weld and the heat affected zone of Ti-24Al-15Nb-1.5Mo alloy consist of large quantities of strip alpha and alpha(2) phases which are parallel arranged and vertical to the direction of stress, and there are also intermittent grain boundaries alpha and alpha(2) phases. All these make microcracks connect and extend fast, reducing the rupture life of specimens. However, under the same deformation condition, the welding seam after gradient heat treatment consist of plenty of fine strip and equiaxed alpha, alpha(2) phases and a few large size alpha, alpha(2) phases. Under the long time load, mcirocracks consume more energy or spend more time in order to go round or go through the large size grains. The long time load at high temperature has little impact on the microhardness.

引用

页码：886 / 890

页数：5

共 20 条

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