Effects of quench-tempering and laser hardening treatment on wear resistance of cast iron
Effects of quench-tempering and laser hardening treatment on wear resistance of cast iron
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DOI：
10.1016/j.jmrt.2020.05.006
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发表时间：
2020-07-01
影响因子：
6.4
通讯作者：
Hu, Ming
中科院分区：
文献类型：
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作者：
Wang, Bingxu;Pan, Yuming;Hu, Ming
研究了调质处理和激光表面硬化处理对灰铸铁磨损性能的影响，并与常规等温淬火灰铸铁进行了对比。四个回火温度316摄氏度（600华氏度），399摄氏度（750华氏度），482摄氏度（900华氏度）或552摄氏度（1025华氏度），恒定保温时间为60分钟，四个等温淬火温度为232摄氏度在热处理设计中，使用了288 ℃（450 ℉）、288 ℃（550 ℉）、343 ℃（650 ℉）或399 ℃（750 ℉），恒定保持时间为120分钟。磨损试验在具有往复式球-板滑动配置的通用机械摩擦试验机上进行。同时，还对显微组织、显微硬度和磨损痕迹进行了分析。通过这项工作，发现激光硬化表面下存在三个区域。区域1是含有莱氏体的激光硬化区域，硬度约为68 HRC。区域2是热影响区，包含硬度约为66 HRC的马氏体。区域3是硬度范围为42.1至24.8HRC的基材。在滑动磨损试验中，调质处理后的灰铸铁耐磨性仅高于未处理试样，但在宏观硬度相近的情况下，其耐磨性低于等温淬火灰铸铁。经激光表面硬化处理后，调质灰铸铁的耐磨性得到了提高。最后，回火温度为552 ℃的激光硬化和淬火回火灰铸铁显示出与等温淬火温度为232 ℃的等温淬火灰铸铁相似的磨损质量损失。通过观察磨损表面，激光硬化区域可以有效地抑制基体区域内裂纹的形成和扩展。此外，激光硬化和淬火回火灰铸铁中具有低硬度的基底可以为灰铸铁工程部件提供增强的延展性和韧性。研究结果对灰铸铁零件激光淬火后热处理工艺的选择具有重要的参考价值。(C)2020作者（S）由爱思唯尔公司出版
The present research studied the combined effects of quench-tempering and laser surface hardening treatments on wear behavior of gray cast iron, and compared results with conventional austempered gray cast iron. Four tempering temperatures of 316 degrees C (600 degrees F), 399 degrees C (750 degrees F), 482 degrees C (900 degrees F) or 552 degrees C (1025 degrees F) with a constant holding time of 60 min and four austempering temperatures of 232 degrees C (450 degrees F), 288 degrees C (550 degrees F), 343 degrees C (650 degrees F) or 399 degrees C (750 degrees F) with a constant holding time of 120 min were utilized in the heat treatment design. The wear tests were carried out on a universal mechanical tribometer with a reciprocating ball-on-plate sliding configuration. Also, the microstructure, micro-hardness profiles and worn tracks were examined. Through this work, it was found that three zones existed under the laser hardened surface. Zone 1 was the laser hardened zone containing ledeburite with hardness of approximately 68HRC. Zone 2 was the heat affected zone containing the martensite with hardness of approximately 66HRC. Zone 3 was the substrate with hardness ranging from 42.1 to 24.8HRC. In the sliding wear tests, the quench-tempering treatment only resulted in higher wear resistance of gray cast iron when compared with untreated specimens, but lower wear resistance than that of austempered gray cast iron under similar macro-hardness. The wear performance of the quench-tempered gray cast iron was enhanced after receiving the laser surface hardening treatment. Finally, the laser hardened and quench-tempered gray cast iron with tempering temperature of 552 degrees C showed similar mass loss due to wear as austempered gray cast iron with an austempering temperature of 232 degrees C. By observing the worn surfaces, the laser hardened regions could effectively inhibit the formation and propagation of cracks developed within the substrate regions. In addition, the substrate with low hardness in laser hardened and quench-tempered gray cast iron may provide enhanced ductility and toughness for gray cast iron engineering components. The results obtained in this research have significant value in selecting the optimum heat treatment process for laser hardened gray cast iron components. (C) 2020 The Author(s). Published by Elsevier B.V.