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首页> 外文期刊>Materials Science and Engineering >Macrostructure, microstructure and mechanical properties evolution during 8Cr4Mo4V steel roller bearing inner ring forging process
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Macrostructure, microstructure and mechanical properties evolution during 8Cr4Mo4V steel roller bearing inner ring forging process

机译：8Cr4MO4V钢滚子轴承内圈锻造过程中的宏观结构，微观结构和机械性能演化

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摘要

Hot ring rolling (HRR) is an advanced partial progressive forming technology that can directly manufacture various sizes of precision bearing rings. How to prefabricate the ring blank will affect the utilization rate of materials, flow lines distribution and microstructure in the forging of bearing rings. To improve product quality, a better understanding the evolution process of flow lines and microstructure during the forging process of bearing rings is needed. The purpose of this paper was to prefabricate the ring blank by back extrusion (BE) and use the HRR process (BE-HRR) to manufacture the pre-forged ring blank into 8Cr4Mo4V steel roller bearing inner ring. The development of flow lines, microstructure and mechanical properties during BE-HRR and spheroidizing annealing (SA) were systematically explored. By interrupting the separate BE-HRR processes were achieved resulting in analysis flow lines and characterization microstructure of each process. The macrostructure results show that the flow lines simulation results of each process are consistent with the experimental results. The reasonable flow lines distribution of roller bearing rings can be obtained by using this technology. The maximum deformation position of the BE and HRR process is in the inner diameter of ring. By combining optical microscopy (OM) and scanning electron microscopy (SEM) results were shown that the microstructure of the bearing ring is inhomogeneous in the whole BE-HRR process, but the microstructure of the bearing ring becomes uniform after SA. The primary carbides are distributed fibrously throughout the BE-HRR process and will not dissolve and disappear. The ultimate tensile strength (UTS) of HRR along the axial direction (AD) and circumferential direction (CD) is higher than that along the radial direction (RD), indicating distinct mechanical anisotropy due to different crack length and fracture paths along elongated grains. After SA, the elongation (EL) along the AD is significant higher than RD and CD owing to smaller grain sizes and microcracks tending to form and propagate first along the flow lines.
机译：热环滚动（HRR）是一种先进的部分渐进式成型技术，可直接制造各种尺寸的精密轴承环。如何预制环形空白将影响材料的利用率，轴承环锻造的流线分布和微观结构。为了提高产品质量，需要更好地理解轴承环锻造过程中的流线和微观结构的进化过程。本文的目的是通过背部挤出预制环形空白，并使用HRR工艺（BE-HRR）制造预锻造环形空白进入8Cr4mo4V钢滚子轴承内圈。系统探索了在BE-HRR和球化退火期间的流动线，微观结构和机械性能的发展。通过中断单独的BE-HRR过程，导致每个过程的分析流线和表征微结构。宏观结构结果表明，每个过程的流线仿真结果与实验结果一致。通过使用该技术可以获得滚子轴承环的合理流线分布。 BE和HRR工艺的最大变形位置处于环的内径。通过组合光学显微镜（OM）和扫描电子显微镜（SEM）结果表明，轴承环的微结构在整个BE-HRR工艺中不均匀，但是轴承环的微观结构在SA之后变得均匀。初级碳化物在整个BE-HRR过程中纤维地分布，并不会溶解和消失。沿轴向（Ad）和圆周方向（CD）的HRR的最终拉伸强度（UTS）高于沿径向（RD），指示由于沿着细长晶粒的不同裂缝长度和断裂路径而不同的机械各向异性。在SA之后，由于较小的晶粒尺寸和微裂纹倾向于沿着流动管线，沿着广告的伸长（EL）显着高于RD和CD。

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