喷丸工艺对17CrNi2Mo钢喷丸层残余应力分布及残余奥氏体含量的影响

Effects of Shot Peening Processes on Residual Stress Distribution and Retained Austenite Content in Shot-peened Layer of 17CrNi2Mo Steel

摘要: 采用不同的喷丸工艺对渗碳淬火17CrNi2Mo钢进行表面强化处理,研究了喷丸工艺对喷丸层残余应力分布及残余奥氏体含量的影响.结果表明:喷丸能在17CrNi2Mo钢表层产生残余压应力,且残余压应力随层深增加而先增加后减小;增大喷丸强度,喷丸层的表面残余压应力、最大残余压应力及其影响层深均增大;增加喷丸次数可增大表面残余压应力和最大残余压应力;喷丸能降低喷丸层的残余奥氏体含量,喷丸强度或喷丸次数越大,残余奥氏体含量越低;残余奥氏体含量随层深增大而增加.

Abstract: The surface strengthening treatment of 17CrNi2Mo steel was conducted using different shot peening (SP) processes,and the effects of SP on the residual stress distribution and the content of retained austenite in shot-peened layer were studied.The result show that SP produced the compressive residual stress (CRS) on the surface of 17CrNi2Mo steel,and CRS increased first,then decreased with the increase of depth.Increasing SP intensities,surface CRS,maximum CRS and influencing depth all increased.Moreover,the increases of SP numbers were beneficial to the improvement of surface CRS and maximum CRS.The retained austenite content decreased after SP,the higher SP intensities and numbers,the smaller austenite contents.Austenite contents decreased with the increase of depth.