Simulation and Analysis of the Effect of Process Parameters on Shot Peening Strengthening of TC4 Alloy
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摘要: 利用有限元法针对TC4钛合金的喷丸强化过程,建立了数值模型。首先,运用Abaqus建立的TC4钛合金喷丸强化的有限元模型,分别计算喷丸速度分别为40、60、80、100 m/s的模型,结果表明:当喷丸速度逐渐增大的过程中,表面残余应力,最大残余压应力和残余压应力层厚度都逐渐增大;其次,建立的TC4钛合金喷丸强化的有限元模型,分别计算了垂直入射、入射角为10°和入射角为20°的模型,结果表明:随着入射角的增大,靶材的表面粗糙度并没有显著变化,但对残余压应力的影响不可忽视,主要体现在最大残余应力由607.3 MPa逐渐减小为504.4 MPa,降幅20.4%,残余压应力层的厚度由158.5 μm降低到145.2 μm,降幅8.4%。入射角度控制在0 ~ 10°之间最合适时可以使得喷丸强化效果最优。Abstract: A numerical model for shot peening of TC4 alloy was established based on the finite element method. Firstly, the finite element for shot peening of TC4 alloy established based on the software of ABAQUS was used to simulate the shot peening speeds of 40, 60, 80, 100 m/s. The results showed that the thickness of the surface residual stress, the maximum residual compressive stress and residual compressive stress layers increasegradually with the increasing of shot peening speed. Secondly, the finite element simulations of shot peening processes were carried out for normal incidence, incidence angle of 10° and incidence angle of 20°. The results showed that with the increasing of incidence angle, the surface roughness of the target would change slightly, but the influence on the residual compressive stress cannot be ignored, which can be explained by that the gradual decrease of the maximum residual stress from 607.3 MPa to 504.4 MPa, a decrease of 20.4%, and the thickness of the residual compressive stress layer from 158.5 μm to 145.2 μm, a decrease of 8.4%. In order to achieve the best shot peening strength and effect, it is suggested to control the incident angle between 0 and 10°.
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Key words:
- titanium alloy /
- shot peening /
- residual stress /
- finite element analysis
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表 1 基本材料参数
参数 TC4 铸钢 密度/(kg·mm−3) 4.428×10−6 7.8×10−6 弹性模量/MPa 1.1×105 2×105 泊松比 0.342 0.3 屈服强度/MPa 1.098×103 − 抗拉强度/MPa 1.092×103 − 表 2 TC4塑性应变参数
真实应力/MPa 973 1014 1047 1108 1156 1198 1234 1264 1281 塑性应变 0 0.012 0.022 0.042 0.061 0.081 0.101 0.121 0.130 -
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