300M钢件表面的喷丸强化

针对300M钢材料研究了4种不同喷丸工艺。分别对喷丸层的残余应力、组织结构、显微硬度及其分布和表面粗糙度进行了测试与分析。结果表明，高硬度陶瓷丸在较低的喷丸强度下可以获得较高的残余压应力，且不会大幅度提高表面粗糙度值；钢丝切丸喷丸后虽然得到比较好的残余应力分布，但伴随的是表面粗糙度值的大幅提高；大粒径高强度钢丝喷丸不会使残余压应力水平得到很好的提高，而是会大幅增加粗糙度值；钢丝切丸+陶瓷丸的复合喷丸强化工艺在粗糙度改变不大的前提下，可以获得较好的强化效果和表层组织结构。

Surface shot peening strengthening of 300M steel parts

Four different shot-peening processes were adopted for the 300M steel, and then the residual stress and its distribution, the microstructure and its distribution, and the microhardness and its distribution the surface roughness, were tested and analyzed respectively for the shot-peening layers to provide technical data for the subsequent guidance of production practice. The results show that the high hardness ceramic shot can obtain high residual compressive stress with lower shot peening strength, and the surface roughness value will not be significantly increased. Although the residual stress distribution is good after shot peening with shots cut from steel wire, the surface roughness increases greatly. Shot peening with large-diameter high-strength steel wire can not improve the compressive residual stress level, but can greatly increase the roughness value. Composite shot peening can effectively solve the contradiction between shot peening strength and roughness. On the premise that the roughness changes little, the composite shot peening process of steel wire cutting shot+ceramic shot can obtain better strengthening effect and surface structure.