Lu Shao-Quan, Chiu Liu-Ho, Chang Pei-Jung, Lin Chung-Kwei
Department of Mechanical and Materials Engineering, Tatung University, Taipei 104-327, Taiwan.
Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110-301, Taiwan.
Materials (Basel). 2024 Aug 20;17(16):4124. doi: 10.3390/ma17164124.
Carburized steel shafts are commonly used in industry due to their good wear resistance and fatigue life. If the surface of carburized shafts exhibits an undesired tensile stress, shot peening treatment may be required to alter the stress condition on the surface. In the present study, the effects of shot peening pressure (3-5 kg/cm), time (32-64 s), and material (stainless steel, carbon steel, and glass) on the residual stress, retained austenite, microhardness, and surface roughness of the carburized shafts were investigated. The experimental results showed that the surface residual tensile stress was changed into compressive stress after the shot peening treatment. The shot peening effects increased with the increasing peening pressure and time. In addition, a significant decrease in the amount of retained austenite in the subsurface region was observed. Peening with different materials can affect the peening effect. Using glass pellets exhibited the best shot peening effect but suffered massive pellet fracture during processing. In overall consideration, the optimal peening parameters for carburized steel shafts for practical industrial applications involved using the stainless-steel pellets with a peening pressure of 5 kg/cm and a peening time of 64 s. The maximum residual stress was -779 MPa at a depth of 0.02 mm, while the highest surface microhardness was 827 HV.
渗碳钢轴因其良好的耐磨性和疲劳寿命而在工业中被广泛使用。如果渗碳钢轴表面出现不期望的拉应力，则可能需要进行喷丸处理以改变表面的应力状态。在本研究中，研究了喷丸压力（3 - 5 kg/cm）、时间（32 - 64 s）和材料（不锈钢、碳钢和玻璃）对渗碳钢轴残余应力、残余奥氏体、显微硬度和表面粗糙度的影响。实验结果表明，喷丸处理后表面残余拉应力转变为压应力。喷丸效果随喷丸压力和时间的增加而增强。此外，观察到亚表面区域残余奥氏体量显著减少。使用不同材料进行喷丸会影响喷丸效果。使用玻璃丸表现出最佳的喷丸效果，但在加工过程中玻璃丸大量破碎。综合考虑，实际工业应用中渗碳钢轴的最佳喷丸参数是使用喷丸压力为5 kg/cm、喷丸时间为64 s的不锈钢丸。在0.02 mm深度处的最大残余应力为 - 779 MPa，而最高表面显微硬度为827 HV。
