水射流工艺对渗碳钢圆棒表层改性影响的研究-《郑州大学学报(工学版)》

文章信息/Info

Title:: Study on the Influence of Water Jet Modification Process on Carburized Steel Round Bars

Author(s):: Ma Yongtao 1; Anlele 2; Zhang London 1; Zhao Lechuan 1; 1. School of Mechanical Engineering, Zhengzhou University; 2. Henan Institute of Resources and Materials Industry Technology, Zhengzhou University

Keywords:: post-mixed water jet peening 18CrNiMo7-6round bar samplesurface modificationresidual stress

摘要:: 研究了后混合水射流喷丸对18CrNiMo7-6齿轮渗碳钢圆棒试样的表层改性工艺，在满足试样圆周面水射流喷丸全覆盖的条件下，采用单因素试验分别研究了圆棒试样转速、喷嘴移动速度、高压水射流泵压力和处理次数对试样材料的表面形貌、表面粗糙度、表层残余应力和硬度的影响，并分别运用超景深三维显微镜、三维表面形貌测量仪、X射线残余应力分析仪及HV-1000显微硬度计等仪器对上述结果进行测量。试验结果表明：后混合水射流喷丸时弹丸和水会对试样表层产生一定的冲蚀和磨损，改变试样表面形貌，试样表面粗糙度、表层残余应力和硬度随着试样转速和喷嘴移动速度的增加而减小，随着泵压力和冲击次数的增加而增大；当试样转速n=100r/min，喷嘴移动速度v=50mm/min，泵压力P=300MPa，处理次数N=1时残余应力最大值约为-1176.25 MPa，硬度最大值为64HRC，比原始试样提升了6.7%。

Abstract:: The surface modification process of 18CrNiMo7-6 gear carburized steel round bar samples by post-mixed water jet peening was studied. Under the condition of satisfying the full coverage of water jet blasting on the circumferential surface of the sample, the single factor experiment was used to study t he effect of sample rotation speed, nozzle moving speed, high pressure water jet pump pressure and number of treatments on the surface topography, surface roughness, surface residual stress and hardness of the sample material, and use super depth of field three-dimensional microscope, three-dimensional surface topography , X-ray residual stress analyzer, HV-1000 microhardness tester and so on to measure t he above results .The experimental results show that after the post-mix ed water jet, the projectile and water will bring certain erosion and wear on the surface of the sample, and the surface morphology of the sample will be changed. The surface roughness, surface residual stress and hardness of the sample decrease with the increase of the sample rotation speed and the nozzle movement speed, and increase with the increase of the pump pressure and the number of treatments when the sample rotation speed n=100r/m in, the nozzle movement speed v=50mm/min, the pump pressure P=300MPa, the number of trea tments N=1, the maximum residual stress is about -1176.25 MPa, and the maximum hardness is 64HRC, which is 6.7% higher than the original sample.