深冷条件下多重旋转碾压超细晶铜的组织与磨损性能

Microstructures and Wear Properties of Ultrafine⁃Grained Cu via Multiple Rotational Rolling under Deep Cooling Condition

周华 贾南 陆亚轩 孟祥晨 黄永宪

Hua ZHOU Nan JIA Yaxuan LU Xiangchen MENG Yongxian HUANG

河钢工业技术服务有限公司，河北 廊坊 065000 先进焊接与连接国家重点实验室，黑龙江 哈尔滨 150001

HBIS Industrial Technical Service Co. ，Ltd. ，Langfang Hebei 065000，China State Key Laboratory of Advanced Welding and Joining，Harbin Heilongjiang 150001，China

通过碾压式搅拌头在深冷条件下对铜板进行多重旋转碾压，采用超景深显微镜、光学显微镜、摩擦磨损仪对碾压后样品的表面形貌、组织和性能进行了分析。结果表明，在深冷条件下多重旋转碾压后，样品表面成形良好，表层出现明显的超细晶区；在转速为50 r/min时，超细晶成形机制为晶粒的剪切破碎；在转速为500 r/min时，晶粒细化机制为动态再结晶和强制冷却抑制再结晶晶粒的长大；在深冷条件下多重旋转碾压制备的超细晶层可提高材料的耐磨性。

The Cu plate was fabricated by a novel grinding tool via multiple rotational grinding under deep cooling condition. The surface morphology, microstructures and properties of the grinding zone were analyzed via super depth of field microscope, optical microscope, friction and wear test, respectively. The results show that well surface formation and ultrafine grains were obtained after multiple rotational grinding under deep cooling condition. Combined with the temperature distribution simulation, the main grain refinement mechanism of 50 r/min is the breaking and split of the grain. The grain refinement mechanism at 500 r/min is dynamic recrystallization and forced cooling to inhibit the growth of recrystallized grains. Microhardness tests and wear tests showed that the ultrafine?grained zone prepared by multiple rotational grinding under deep cooling condition could improve the wear resistance of the materials.

国家自然科学基金项目(52175301);航空发动机及燃气轮机专项资助项目（J2019?Ⅶ?0012?0154）;中国博士后科研基金项目(2021T140151)

10.12422/j.issn.1672-6952.2024.02.008