TA15钛合金壳体挤压开裂产生机理及工艺优化

Mechanism and process optimization of extrusion cracking of TA15 titanium alloy shell

  • 摘要: 针对TA15钛合金壳体在热挤压时由于材料变形不均匀,产生较大的附加拉应力,导致壳体四周出现严重开裂缺陷的问题,采用数值模拟与实验相结合,对TA15钛合金壳体热挤压实验工艺参数进行改进和优化,以减小体薄壁处温度差,避免开裂缺陷。通过预先挤压热态工艺,提高了热挤压模具内表面的初始温度,使用玻璃润滑剂改善模具与壳体之间接触面的润滑条件,同时减少了壳体挤压过程中的热量损失。结果表明,可以通过模拟预测的方式,成功将壳体薄壁处温度差控制在小于100℃。参考数值模拟的工艺参数进行了实验,验证了工艺方法的可行性,解决了TA15钛合金的波纹状挤压开裂问题。

     

    Abstract: Aiming at the problem that TA15 titanium alloy shell has severe cracking defects around the shell due to uneven material deformation resulting in large adjoint stress during hot extrusion , by combining numerical simulation and experiment, the experimental parameters of TA15 titanium alloy shell were improved and optimized to reduce the temperature difference at the thin wall and avoid cracking defects. The initial temperature of the inner surface of the hot extrusion die was increased by pre-extruding the hot process material, the lubrication condition of the contact surface between the die and the shell was improved by using glass lubricant, and the heat loss during the extrusion process of the shell was reduced at the same time. The results show that the temperature difference at the thin wall of the shell can be successfully controlled to less than 100℃ by means of simulation and prediction. Experiments were carried out with reference to numerical simulation process parameters, the feasibility of the process method is verified, and the corrugated extrusion cracking problem of TA15 titanium alloy is solved.

     

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