摘要
为了获得准确的TC17钛合金线性摩擦焊中的残余应力,建立TC17钛合金弹性常数与相分数之间的数值关系。结合焊接区域的相分数,获得呈梯度分布的弹性常数,并将其引入轮廓法进行计算。结果表明,TC17钛合金的弹性常数与α相分数呈正相关,在宽度约4 mm的焊接区域呈现明显的梯度分布特征;若忽略相分数的梯度分布,计算残余应力时相对误差可达36.06%;修正后的残余应力呈双峰分布,在热影响区边缘处达到峰值,约为442 MPa。这说明考虑相分数的梯度分布是必要的。
To obtain accurate residual stresses in linear friction welding of TC17 alloy,a numerical relationship between the elastic constants and phase fraction of TC17 alloy was established.The elastic constants with gradient distribution were obtained by combining the phase fraction and introduced into the contour method.The results show that the elastic constants of TC17 alloy are positively correlated withαphase fraction and present a significant gradient distribution in the welding area with a width of about 4 mm.The relative error in calculating the welding residual stresses can be up to 36.06%if the gradient distribution of phase fraction is ignored.The corrected residual stresses in the welding area exhibit a bimodal distribution,with a peak stress of~442 MPa located at the edge of the heat-affected zone.The results demonstrate the necessity of considering the phase fraction with gradient distribution.
作者
何鹏
吴运新
张涛
陈送义
张晨
Peng HE;Yun-xin WU;Tao ZHANG;Song-yi CHEN;Chen ZHANG(Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,Changsha 410083,China)
基金
supported by the National Natural Science Foundation of China (No. 51975596)
the Fundamental Research Funds for the Central Universities of Central South University, China (No. CX20220285)。
关键词
线性摩擦焊
TC17钛合金
残余应力
相分数
梯度分布
linear friction welding
TC17 titanium alloy
residual stresses
phase fraction
gradient distribution
