摘要
采用预渗氮+淬回火(N+Q)及碳氮共渗+淬回火(C+Q)两种化学热处理对GCr15钢进行表面强化,并与淬回火的GCr15钢进行对比。采用X射线衍射仪、扫描电镜、光学显微镜、显微硬度计等研究了不同热处理后GCr15钢的物相、组织结构及硬度,利用UMT-2摩擦磨损实验机分析了不同热处理后GCr15钢的摩擦学特性。结果表明:预渗氮+淬回火(N+Q)及碳氮共渗+淬回火(C+Q)处理后GCr15钢的显微组织由马氏体、碳/氮化物及残留奥氏体组成,其中,C+Q处理后生成的碳/氮化物组织尺寸更为粗大;经过N+Q及C+Q处理后GCr15钢的表层硬度均高于经淬回火后的硬度,硬化层深度分别为0.25 mm、0.30 mm;摩擦磨损实验表明,C+Q处理可以有效降低GCr15钢的摩擦系数及磨损率,磨损机制主要为磨粒磨损。
Surface strengthening of GCr15 steel was carried out by two kinds of chemical heat treatment: pre-nitriding + quenching and tempering(N+Q) and carbonitriding + quenching and tempering(C+Q), and compared with quenched and tempered GCr15 steel. Phase, microstructure and hardness of the GCr15 steel after different heat treatments were studied by means of X-ray diffractometer, scanning electron microscopy, optical microscope and microhardness tester. The tribological characteristics of the GCr15 steel after different heat treatments were analyzed by UMT-2 friction and wear tester. The results show that the microstructure of the GCr15 steel after pre-nitriding + quenching and tempering(N+Q) and carbonitriding + quenching and tempering(C+Q) is composed of martensite, carbon/nitride and retained austenite, and the size of carbon/nitride structure after C+Q treatment is coarser. The surface hardness of the GCr15 steel after N+Q and C+Q treatment is higher than that after quenching and tempering, and the depth of hardened layer is 0.25 mm and 0.30 mm, respectively. The friction and wear experiments show that the C+Q treatment can effectively reduce the friction coefficient and wear rate of the GCr15 steel, and the wear mechanism is mainly abrasive wear.
作者
郇庆婷
杜三明
王梦丹
贺甜甜
张永振
HUAN Qing-ting;DU San-ming;WANG Meng-dan;HE Tian-tian;ZHANG Yong-zhen(National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Luoyang 471023,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2021年第5期117-123,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51905153)
固体润滑国家重点实验室开放基金(重点基金LSL-1916)。
