喷丸对23Co14Ni12Cr3Mo超高强度钢表面性能的影响

针对23Co14Ni12Cr3Mo超高强度钢材料,研究喷丸强化对其表面性能的影响。采用扫描电镜、白光干涉仪等设备,分析喷丸强化对试样表面形貌、粗糙度、硬度、残余应力、元素含量等的影响。结果表明:喷丸强化后,试样表面留有大量弹坑,产生明显塑性变形;表面粗糙度增大,算术平均粗糙度为1. 33μm;硬度显著增大,最表层硬度由喷丸前的HV 476增加至HV 497,硬化层深度约150μm;试样表层的残余压应力值由375 MPa增加至475 MPa,最大残余压应力值约518 MPa,位于距表面50μm深度处,喷丸形成的残余压应力层深度约为134μm;喷丸后试样中C、Si、Cr等各元素的质量分数均略有增加。喷丸在一定程度上改善了23Co14Ni12Cr3Mo钢材料的表面性能,有利于提高其疲劳抗力和耐腐蚀性。

Effect of Shot Peening on Surface Properties of 23Co14Ni12Cr3Mo Ultra High Strength Steel

The effect of shot peening on the surface properties of 23Co14Ni12Cr3Mo ultra-high strength steel was studied. Scanning electron microscope and white light interferometer were used to analyze the effect of shot peening on the surface morphology, roughness, hardness, residual stress and element content of the samples. The results show that after shot peening, a large number of craters remain on the surface of the samples, resulting in obvious plastic deformation. The surface roughness is increased, and the arithmetic mean roughness is 1.33 μm. The hardness is significantly increased, the hardness of the outermost layer is increased from HV 476 before shot peening to HV 497, and the depth of hardened layer is about 150 μm. The residual compressive stress value of the surface layer of the sample is increased from 375 MPa to 475 MPa, the maximum residual compressive stress value is about 518 MPa, located at a depth of 50 μm from the surface, and the residual compressive stress layer formed by shot peening has a depth of about 134 μm. The mass fraction of C, Si, Cr and other elements in the sample after shot peening increased slightly. Shot peening improves the surface properties of 23Co14Ni12Cr3Mo steel material to a certain extent, which is beneficial to its fatigue resistance and corrosion resistance.