Optimization and design of thickness of bearing steel layer diffusion bonding on titanium alloy surface
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摘要: 为了确定钛合金表面扩散焊接轴承钢硬化层的合适厚度,利用先进的纳米显微力学探针测量了材料的弹性模量.采用ANSYS有限元软件,对钛合金表面扩散焊接轴承钢硬化层在受压情况下的应力分布以及尺寸稳定性进行了分析,以此对轴承钢硬化层的厚度进行了模拟.结果表明,当轴承钢硬化层厚度在0.10~0.50mm内时,最大等效应力发生在镍与铜之间,容易引起界面处裂纹的产生;合适的轴承钢硬化层厚度范围应为1.00~2.00mm,最佳的厚度为1.50mm左右.Abstract: In order to confirm the appropriate thickness of bearing steel layer diffusion bonding on titanium alloy surface, the elastic modulus of materials was measured by Nano Indenter Ⅱ. Stress distribution and integrated distortion of the titanium alloy which bonded bearing steel layer were analyzed by finite element simulation under press stress, and the thickness of bearing steel layer was optimized and designed. The results show that when the thickness of hardened layer is 0.10-0.50 mm, the maximal equivalent stress is located the interface of titanium alloy and bearing steel layer, which can easily induce interface cracks; the appropriate thickness of bearing steel layer is 1.00-2.00 mm, and the optimal thickness is about 1.50 mm.
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Keywords:
- bearing steel /
- titanium alloy /
- diffusion bonding /
- hardened layer /
- finite element analysis
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