42CrMo钢轴承环件铸辗成形及淬回火组织性能研究
发布时间：2018-08-28 08:51
【摘要】：42CrMo轴承环件是高铁动车和风力发电等装备制造领域关键承载、传动构件。基于环件铸辗复合成形技术开展42CrMo钢轴承环件离心铸造、热辗扩成形及淬回火试验研究,分析高温变速进给时辗扩成形环件的微观组织及力学性能,并对后续淬回火过程组织性能演变规律进行探讨。结果表明,成形环件沿径向厚度区域晶粒得到细化,环件近中层和最小宽展处伴有不规则和等轴状的粗大晶粒;强度、硬度值较高,塑、韧性偏差,拉伸和冲击断口形貌表现为韧窝均聚集在剪切唇上,以解理断裂形式为主。530℃回火时沿环件壁厚方向未观察到碳化物,塑韧性仍较低;590℃回火后析出少量细小、弥散分布的碳化物颗粒,各项力学性能指标均满足标准要求,拉伸断口的韧窝数量多、直径大,冲击断口也比530℃时的平整,韧窝分布更加均匀,使得铸辗复合成形轴承环件的强度和塑韧性得到良好的配合。
[Abstract]:42CrMo bearing ring is a key bearing and transmission component in the manufacturing field of high-speed train and wind power. The 42CrMo steel bearing ring centrifugal casting, hot rolling forming and quenching and tempering experiments were carried out based on the ring casting and rolling compound forming technology. The microstructure and mechanical properties of the ring were analyzed. The evolution law of microstructure and properties during subsequent quenching and tempering was discussed. The results show that the grain size of the forming ring is refined along the radial thickness region, the coarse grain is irregular and equiaxed at the near middle layer and the minimum width of the ring, and the strength, hardness, ductility and hardness are higher, the ductility and toughness of the ring are deviated from each other. The morphology of tensile and impact fracture shows that the dimples are clustered on the shearing lips, and no carbides are observed in the direction of wall thickness of the rings during tempering at .530 鈩，
本文编号：2208903
[Abstract]:42CrMo bearing ring is a key bearing and transmission component in the manufacturing field of high-speed train and wind power. The 42CrMo steel bearing ring centrifugal casting, hot rolling forming and quenching and tempering experiments were carried out based on the ring casting and rolling compound forming technology. The microstructure and mechanical properties of the ring were analyzed. The evolution law of microstructure and properties during subsequent quenching and tempering was discussed. The results show that the grain size of the forming ring is refined along the radial thickness region, the coarse grain is irregular and equiaxed at the near middle layer and the minimum width of the ring, and the strength, hardness, ductility and hardness are higher, the ductility and toughness of the ring are deviated from each other. The morphology of tensile and impact fracture shows that the dimples are clustered on the shearing lips, and no carbides are observed in the direction of wall thickness of the rings during tempering at .530 鈩，
本文编号：2208903
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