陈春伦,冯爱新,危亚城,王宇,潘晓铭,邱辉.无涂层激光冲击强化对40CrNiMo结构钢摩擦磨损性能的影响[J].表面技术,2023,52(5):356-363, 397.
CHEN Chun-lun,FENG Ai-xin,WEI Ya-cheng,WANG Yu,PAN Xiao-ming,QIU Hui.Effect of Laser Shock Peening without Coating on Friction and Wear Properties of 40CrNiMo Structural Steel[J].Surface Technology,2023,52(5):356-363, 397 |
| 无涂层激光冲击强化对40CrNiMo结构钢摩擦磨损性能的影响 |
| Effect of Laser Shock Peening without Coating on Friction and Wear Properties of 40CrNiMo Structural Steel |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.035 |
| 中文关键词: 40CrNiMo结构钢 无涂层激光冲击强化 激光冲击强化 显微组织 显微硬度 残余压应力 耐磨性 |
| 英文关键词:40CrNiMo structural steel LSPwC LSP microstructure microhardness residual compressive stress wear resistance |
| 基金项目:浙江省自然科学基金(LY20E050027);温州市科技局重大科学与科技专项(ZG2019002) |
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| Author | Institution |
| CHEN Chun-lun | College of Mechanical and Electrical Engineering,Zhejiang Wenzhou 325035, China;Rui'an Graduate College,Zhejiang Wenzhou 325035, China ;Zhejiang Zhenxing Petrochemical Machinery Company Limited, Zhejiang Wenzhou 325035, China |
| FENG Ai-xin | College of Mechanical and Electrical Engineering,Zhejiang Wenzhou 325035, China;Rui'an Graduate College,Zhejiang Wenzhou 325035, China ;Zhejiang Provincial Key Laboratory of Laser Processing Robots/Key Laboratory of Laser Processing and Testing in Machinery Industry, Zhejiang Wenzhou 325035, China |
| WEI Ya-cheng | College of Mechanical and Electrical Engineering,Zhejiang Wenzhou 325035, China;Rui'an Graduate College,Zhejiang Wenzhou 325035, China |
| WANG Yu | College of Mechanical and Electrical Engineering,Zhejiang Wenzhou 325035, China;Rui'an Graduate College,Zhejiang Wenzhou 325035, China |
| PAN Xiao-ming | College of Mechanical and Electrical Engineering,Zhejiang Wenzhou 325035, China;National International Science and Technology Cooperation Base for Laser Processing Robots, Wenzhou University, Zhejiang Wenzhou 325035, China;Zhejiang Provincial Key Laboratory of Laser Processing Robots/Key Laboratory of Laser Processing and Testing in Machinery Industry, Zhejiang Wenzhou 325035, China |
| QIU Hui | College of Mechanical and Electrical Engineering,Zhejiang Wenzhou 325035, China |
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| 中文摘要: |
| 目的 采用无涂层激光冲击强化技术诱导残余压应力和细化晶粒，提高40CrNiMo结构钢的显微硬度及耐磨性。方法 采用高功率激光束对40CrNiMo结构钢表面进行激光冲击强化处理，通过显微组织观察、XRD检测、显微硬度测试、残余应力测试、摩擦磨损实验及磨损形貌观察，对比分析未处理试样、有涂层激光冲击强化处理试样和无涂层激光冲击强化处理试样的显微组织、显微硬度、残余应力和摩擦磨损性能。结果 在有/无铝箔涂层、去离子水约束层作用下分别对40CrNiMo结构钢试样进行有涂层/无涂层激光冲击强化处理，诱导产生残余压应力和晶粒细化，试样表面显微硬度分别提高至313.5HV 和336.9HV，提高了约13.5%和21.9%，表面最大残余压应力达到–405.3 MPa和–326.6 MPa;有涂层激光冲击强化处理试样的摩擦因数较稳定，降低了约14.1%，而无涂层激光冲击强化处理试样的摩擦因数出现较大波动，在摩擦磨损前期，摩擦因数降低了22.9%;在摩擦磨损中后期，摩擦因数降低了7.9%。未处理试样的磨损量为13 mg，有涂层激光冲击强化处理试样和无涂层激光冲击强化处理试样的磨损量分别为6 mg和8 mg，减少了约53.8%和38.5%。结论 与有涂层激光冲击强化相比，无涂层激光冲击强化对40CrNiMo结构钢耐磨性能的强化效果较差。由于无涂层激光冲击强化无需涂覆涂层就能够进行激光冲击强化处理，因此可以有效提高加工效率、节省涂层成本，同时在一定程度上也提高了40CrNiMo结构钢的显微硬度和耐磨性。 |
| 英文摘要: |
| 40CrNiMo structural steel has excellent mechanical properties and is widely used in key components such as turbine shafts, gear shafts and large ring gears. In view of the problems of fatigue and fracture of these mechanical parts in harsh working conditions, the surface of 40CrNiMo structural steel is subject to laser shock peening (LSP) treatment by high-power laser beam. The work aims to improve the microhardness and wear resistance of 40CrNiMo structural steel by inducing residual compressive stress and refining grains through laser shock peening without coating. By means of metallographic microscope, XRD test, microhardness tester, residual stress tester, friction tester and laser scanning confocal microscope, the microstructure, microhardness, residual stress and friction and wear properties of the untreated sample, the LSP sample (with coating) and the LSPwC sample were compared and analyzed. The 40CrNiMo structural steel samples were subject to LSP treatment with/without coating under the action of aluminum foil coating/no-coating and deionized water confinement layer, respectively, which induced residual compressive stress and grain refinement. The diffraction peaks of the samples were all shifted, and the average grain size of the samples treated with LSP (with coating) and LSPwC decreased by 6.0% and 9.6%, the surface microhardness of the samples increased to 313.5HV and 336.9HV, an increase of 13.5% and 21.9%, and the maximum residual compressive stress on the surface could reach –405.3 MPa and –326.6 MPa. After the LSP treatment, the wear surface of the samples was less worn and the number of pits and furrows was reduced, but the width of the furrows varied. The friction coefficient of the LSP (with coating) sample was relatively stable, decreasing by about 14.1%. The friction coefficient of the LSPwC sample was staged relatively. In the early stage of friction and wear, the friction coefficient was reduced by 22.9% compared with that of the untreated sample and 3.2% lower than that of the LSP sample. The main reason was that in the LSPwC process, the laser was in direct contact with the surface of the sample, which induced thermal effects and plastic deformation, thus increasing the number of austenite nucleation. At the same time, the dispersed carbides prevented the growth of austenite grains, and the distribution was uniform, which improved the wear resistance of the sample surface, so that the friction coefficient of the outer layer was the lowest and the wear resistance was the best. In the middle and late stages of friction and wear, compared with that of untreated sample, the friction coefficient decreased by 7.9%, but increased by 4.8% compared with that of LSP sample. Compared to the LSP (with coating) sample, the LSPwC sample show an increased number of pits and oxides on the surface and the presence of larger furrows. As the depth increased, the thermal effect of LSPwC decreased rapidly, and because there was no coating in the LSPwC process, the absorption rate of laser energy was reduced, resulting in a smaller shock wave energy. Thus, the plastic deformation effect was weakened, and the wear resistance was also reduced. The wear amount of the untreated sample was 13 mg and those of the LSP (with coating) sample and the LSPwC sample were 6 mg and 8 mg, respectively, which decreased by 53.8% and 38.5%. On the whole, compared with LSP (with coating), LSPwC has a poorer effect on the wear resistance of 40CrNiMo structural steel, but LSPwC can be directly applied to complex working conditions and structures with complex structures, because LSPwC can be carried out under the condition of no coating, thereby effectively improving the processing efficiency and saving the cost of the coating. At the same time, the microhardness and wear resistance of 40CrNiMo structural steel are also improved to a certain extent. |
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