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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Heat Treatment Process on Microstructure and Crystallography of 20CrMnTiH Spur Bevel Gear
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Effect of Heat Treatment Process on Microstructure and Crystallography of 20CrMnTiH Spur Bevel Gear

机译：热处理过程对20CrmnTiH锥齿轮组织和晶体学的影响

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摘要

Obtaining excellent mechanical properties of spur bevel gear has been widely emphasized, owing to its indispensable effect on momentum. However, the conventional long-time and high-temperature heat treatment can cause microstructure coarsening, which dramatically decreases the mechanical properties. Since the normalizing process can significantly modulate the mechanical properties of spur bevel gears by adjusting their microstructure and crystallography behaviors, in the present study, the normalizing before or after carburizing heat treatment processes (NBCP and NACP, respectively) were proposed. The effect of heat treatment processes on the microstructure and crystallography of gear specimens was investigated. The results show that both NBAP and NACP had a strong effect on microstructure refinement and hardness improvement compared to the conventional process. NBCP raised the tendency for AlN precipitation, which could retard the microstructure coarsening during carburizing. Furthermore, NACP directly promoted the precipitation of globular Cr-rich M3C carbides which achieved the strongest pinning effect and brought about extremely fine microstructure. For crystallographic analysis, the 24 martensite variants in all gear specimens held Kurdjumov-Sachs orientation relationship to parent austenite. The orientations of martensite variants in gear specimens applying conventional process and NBCP were distributed regularly. However, the orientations of martensite variants in NACP gear specimen did not follow the strict rule for variant selection inside prior austenite grains owing to the distortive effect of diffuse M3C carbides on the matrix, and the adjacent martensite variants possessed less sharing of {110} habit plane compared to NBCP and conventional process.
机译：由于正锥齿轮对动量有着不可或缺的作用，因此获得优良的机械性能一直受到广泛重视。然而，传统的长时间高温热处理会导致组织粗化，从而显著降低力学性能。由于正火工艺可以通过调整直齿锥齿轮的微观结构和晶体学行为来显著调节其力学性能，因此本研究提出了渗碳热处理前后的正火工艺（分别为NBCP和NACP）。研究了热处理工艺对齿轮试样微观结构和晶体学的影响。结果表明，与常规工艺相比，NBAP和NACP均对组织细化和硬度提高有显著影响。NBCP提高了渗碳过程中AlN析出的趋势，从而延缓了渗碳过程中组织的粗化。此外，NACP直接促进了球状富Cr M3C碳化物的析出，从而实现了最强的钉扎效应，并产生了极其精细的微观结构。对于晶体学分析，所有齿轮试样中的24种马氏体变体与母奥氏体具有库德朱莫夫-萨克斯取向关系。采用常规工艺和NBCP的齿轮试样中马氏体变体的取向呈规则分布。然而，由于扩散的M3C碳化物对基体的畸变作用，NACP齿轮试样中马氏体变体的取向没有遵循之前奥氏体晶粒内部变体选择的严格规则，相邻马氏体变体与NBCP和常规工艺相比，具有较少的{110}习惯面共享。

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