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Selection of heat treatment process and Wear Mechanism of High Wear Resistant Cast Hot-Forging Die Steel

Journal of Iron and Steel Research International 2012年第5期19卷 50-57页

作者： WEI Min-xian WANG Shu-qi WANG Lan CUI Xiang-hong CHEN Kang-min School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

Dry sliding wear tests of a Cr-Mo-V cast hot-forging die steel was carried out within a load range of 50--300 N at 400℃ by a pin-on-disc high temperature wear machine. The effect of heat treatment process on wear resistance was systematically studied in order to select heat treatment processes of the steel with high wear resistance. The morphology, structure and composition were analyzed using scanning electron microscopy （SEM）, X-ray diffraction （XRD） and energy dispersive spectroscopy （EDS） ; wear mechanism was also discussed. Tribo-oxide layer was found to form on worn surfaces to reduce wear under low loads, but appear inside the matrix to increase wear under high loads. The tribo-oxides were mainly consisted of Fe3O4 and Fe2O3, FeO only appeared under a high load. Oxidative mild wear, transition of mild-severe wear in oxidative wear and extrusive wear took turns to operate with increasing the load. The wear resistance strongly depended on the selection of heat treatment processes or microstructures. It was found that bainite presented a better wear resistance than martensite plus bainite duplex structure, martensite structure was of the poorest wear resistance. The wear resistance increased with increasing austenizing temperature in the range of 920 to 1 120 ℃, then decreased at up to 1 220 ℃. As for tempering temperature and microstructure, the wear resistance increased in following order： 700℃ （tempered sorbite）, 200 ℃ （tempered martensite）, 440 to 650 ℃ （tempered troostite）. An appropriate combination of hardness, toughness, microstructural thermal stability was re- quired for a good wear resistance in high-temperature wear. The optimized heat treatment process was suggested for the cast hot-forging steel to be austenized at 1020 to 1 120 ℃, quenched in oil, then tempered at 440 to 650℃ for 2 h.

关键词： cast hot-forging die steel heat treatment process high-temperature wear mechanism wear behavior microstructure

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Regulation mechanism for the formation and microwave absorbing performance of CNT/CoFe-MOF derived hierarchical composite

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International Journal of Smart and Nano Materials 2022年第2期13卷 273-292页

作者： Jinxiao Wang Jianfeng Yang Jun Yang State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’anP.RChina School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’anP.RChina

The structure design,performance analysis,and process optimization of CNT/MOF-derived hierarchical composite play an important role in the development of high-performance microwave absorbing ***,the preparation,morphology evolution,and electromag-netic wave absorption mechanism of CNT/MOF-derived hierarchical composite were systematically *** regulation mechan-ism was revealed by studying the changes in the morphological characteristics,electromagnetic properties,and microwave absorbing performance of CNT/MOF-derived hierarchical composite under differ-ent process *** results show that the morphological characteristics and interface bonding between CNT and MOF have a great impact on the absorptive *** composite with com-position of 0.28Co/0.26Fe has a maximum absorption of−46 dB at 8.6 GHz and a thickness of 4 *** addition,the absorption band with reflection loss values of less than−20 dB can be operated with this thickness between 7.15 and 10.18 GHz,showing excellent absorbing ability and electromagnetic wave *** regulation mechan-ism of CNT/MOF-derived hierarchical composite mainly depends on the effect of Lorentz force,the ion disorder of CoO-Fe_(2)O_(3) heterojunc-tion,and the spin polarization mechanism of free *** study further improves the corresponding theoretical basis and new design principles,which provides technical support for the development of high-performance absorbing materials.

关键词： Regulation mechanism heat treatment process homogeneous distribution bonding modes

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Air cushion furnace technology for heat treatment of high quality aluminum alloy auto body sheet

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Engineering Sciences 2014年第5期12卷 73-80页

作者： Li Yong Wang Zhaodong Ma Mingtu Wang Guodong Fu Tianliang Li Jiadong Liang Xiong The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China China Automotive Engineering Research Institute Co. Ltd. Chongqing 401122 China

The process characteristics of heat treatment of aluminum alloy auto body sheet and the working principle of air cushion furnace were *** process position and irreplaceable role of air cushion furnace in the aluminum alloy auto body sheet production was pointed out after the difficulty and key points in the whole production process of auto body sheet were *** the development process of air cushion furnace line of aluminum alloy sheet was reviewed,summarized and divided to two *** on the research of air cushion furnace,the key technology of it was analyzed,then the key points on process,equipment and control models of air cushion furnace for aluminum alloy auto body sheet in future were put *** the rapid development of automotive industry,there will be certainly a new upsurge of research and application of air cushion furnace for heat treatment of aluminum alloy auto body sheet.

关键词： aluminum alloy auto body sheet shate products air cushion furnace heat treatment process

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