首页|回火温度对20CrMnTi渗碳淬火钢组织和摩擦磨损性能的影响

回火温度对20CrMnTi渗碳淬火钢组织和摩擦磨损性能的影响

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为了研究回火温度对20CrMnTi渗碳淬火钢组织和摩擦磨损性能的影响,对20CrMnTi渗碳淬火钢进行不同回火温度(160~350 ℃)的处理,然后采用扫描电镜、洛氏硬度计对其组织、硬度进行分析,并通过光学显微镜、摩擦磨损试验机对其摩擦磨损性能进行表征.结果表明:当回火温度为160~210 ℃时,试样表面组织以马氏体为主,试验过程中马氏体易脱落,作为硬质颗粒在摩擦表面移动,导致磨损机制以磨粒磨损为主.当回火温度为250 ℃时,试样表面的组织主要由马氏体、贝氏体、残余奥氏体和渗碳体组成,此时材料具有良好的强韧性匹配,磨损率最低,为2.702×10-8 mm3/(N·m),磨损机制为轻微磨粒磨损.当回火温度为300、350 ℃时,试样表面组织以贝氏体为主,材料韧性在提高的同时其表面硬度大幅度降低,导致材料磨损加剧.20CrMnTi渗碳淬火钢的回火温度应控制在略高于Ms临界温度,可以获得马氏体+贝氏体+残余奥氏体+渗碳体的复相组织,此时试样的耐磨性能最佳.
Effects of Tempering Temperature on Microstructure and Friction and Wear Properties of 20CrMnTi Carburized Quenching Steel
In order to study the effects of tempering temperature on the microstructure and friction wear properties of 20CrMnTi carburized steel,20CrMnTi carburized steel was treated with different tempering temperatures(160 ℃-350 ℃).Then,the microstructure and hardness were characterized by using the scanning electron microscope,Rockwell hardness tester.Also,the friction and wear properties of different samples were investigated by using the optical microscope and the friction and wear testing machine.The results show that when the tempering temperature is 160 ℃-210 ℃,the surface microstructure of the sample is mainly martensite,and the martensite peel off and slides as hard particles on the surface,the wear mechanism is mainly abrasive wear.When the tempering temperature is 250 ℃.The surface microstructure of the sample is mainly composed of martensite,bainite,residual austenite and carburite,the material has good strong and toughness combination,it's wear rate is minimum of 2.702 ×10-8 mm3/(N m),and the wear mechanism is slight abrasive wear.When the tempering temperature is 300 ℃ and 350 ℃,the surface microstructure of the sample is mainly bainite.The toughness of the material is imporoved,and the surface hardness is greatly reduced,resulting in the increase of material wear.The tempering temperature of 20CrMnTi carburized quenching steel should be controlled slightly above Ms critical temperature,the phase microstructure of martenite+bainite+residual austenite+carburite can be obtained,at this time,the sample has the best wear resistance.

carburized quenching steeltemperingfriction and wearmicrostructure

李克凡、陈正周、于爱兵、齐少春、王贵林、邹翩、吴森凯、赵家震

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宁波大学机械工程与力学学院,浙江宁波 315211

宁波中大力德智能传动股份有限公司,浙江宁波 315301

渗碳淬火钢 回火 摩擦磨损 微观组织

国家自然科学基金项目宁波市科技创新2025重大专项项目

518752942021Z077

2024

热加工工艺
中国船舶重工集团公司热加工工艺研究所 中国造船工程学会船舶材料学术委员会

热加工工艺

CSTPCD北大核心
影响因子:0.55
ISSN:1001-3814
年,卷(期):2024.53(18)
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