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采用深冷挤出切削法(CT-EM)制备了6061铝合金切削带材,研究了CT-EM切屑与常温挤出切削(RT-EM)切屑的微观组织、热稳定性及摩擦磨损性能。结果表明:在相同的切削速度下,CT-EM制备的切屑要比RT-EM制备的切屑硬度高13.2%;在不同的摩擦载荷下,CT-EM切屑的摩擦系数均比RT-EM切屑的摩擦系数低,表明其耐磨性能有所提升;随着摩擦载荷的增加,切屑的摩擦系数均降低;经250℃退火处理1 h后,CT-EM切屑组织内的位错密度有所降低,晶粒尺寸保持在超细晶的范围之内,可以维持较好的热稳定性。经450℃退火处理1 h后,CT-EM切屑组织内的位错消失,晶粒尺寸增大为微米级,失去热稳定性;在150～450℃退火处理1 h后,CT-EM切屑的硬度先上升后快速下降,最后趋于稳定;在250℃退火处理0.5～2 h后,CT-EM切屑的硬度在刚开始的0.5 h内快速降低,之后逐渐趋于稳定。
Abstract：6061 aluminum alloy cutting strips were prepared using the cryogenic temperature extrusion machining(CT-EM) method, and microstructure, thermal stability, and friction and wear properties of CT-EM chips and room temperature extrusion machining(RT-EM)chips were studied. The results show that at the same cutting speed, the chips prepared by CT-EM have a 13. 2% higher hardness than those prepared by RT-EM. Under different friction loads, the friction coefficient of CT-EM chips is lower than that of RT-EM chips,indicating an improvement in their wear resistance. As the friction load increases, the friction coefficient of the chips both decreases. After annealing at 250 ℃ for 1 h, the dislocation density in the CT-EM chips structure decreases, and the grain size remains within the range of ultrafine grains, which can maintain good thermal stability. After annealing at 450 ℃ for 1 h, the dislocations in the CT-EM chips structure disappear, and the grain size increases to the micrometer level, resulting in loss of thermal stability. After annealing at 150-450 ℃ for 1 h, the hardness of the CT-EM chips first increases, then rapidly decreases, and finally stabilizes. After annealing at 250 ℃for 0. 5-2 h, the hardness of the CT-EM chips rapidly decreases within the first 0. 5 h and gradually stabilizes thereafter.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0360
中图分类号:TG146.21;TG376;TG506
引用信息:
[1]殷晓龙,吴亚威,郭润宇等.深冷挤出切削制备超细晶6061铝合金的热稳定性及摩擦磨损性能[J].材料热处理学报,2025,46(06):26-34.DOI:10.13289/j.issn.1009-6264.2024-0360.
基金信息:
国家自然科学基金(52105499); 中原工学院学科青年硕导培育计划项目(SD202406); 中原工学院基本科研业务费专项资金项目(K2022YY001); 中原工学院青年骨干教师资助项目(2024XQG09)