300M钢多弹丸喷丸强化的有限元模拟

Finite Element Simulation of Multi-Shots Shot Peening of 300M Stainless Steel

过去,结合喷丸气压和弹丸动能进行数值模拟研究喷丸强化效果的报道不多。采用ABAQUS/Explicit有限元软件对300M钢喷丸强化过程进行数值模拟,在喷丸气压和动能相等的条件下,通过改变弹丸直径确定不同工艺参数对金属靶材进行喷丸处理,对比分析了金属靶材表面残余应力场变化曲线、表面法向位移变化曲线以及表面等效塑性应变。结果表明:不同的喷丸工艺下均可使金属靶材表面获得一定深度的残余压应力场,靶材表面的能残余压应力场强度随弹丸直径增加而增加;对靶材金属施加相同弹丸动能输入时,不同喷丸工艺喷丸效果差距不明显,这为相同喷丸强化要求条件下选取不同喷丸工艺参数提供了理论依据。

Few reports are currently available about the numerical simulation analysis of shot peening effectiveness involving both shot peening pressure and pill diameter. Therefore,the shot peening strengthening process of 300M stainless steel was numerically simulated with finite element software ABAQUS / Explicit. The shot peening of the steel was conducted under identical shot-peening pressure and kinetic energy while the other processing parameters were adjusted by varying pill diameter. Besides, the surface residual stress field curve,surface displacement curve in normal direction and surface equivalent plastic strain were compared.Results showed that residual compressive stress field was formed at a certain depth beneath the surface of the steel substrate under different shot peening parameters,and the shot peening intensity as well as the intensity of residual compressive stress field on steel surface rose with increasing pill diameter. In the meantime,when the same kinetic energy input was applied to the target steel,similar shot peening effectiveness was obtained under different shot peening parameters. The present research could provide reference for selecting various shot peening processes under the condition that the requirements for shot peening strengthening were the same.