• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (16): 89-96.

• 论文 • 上一篇    下一篇

42CrMo钢热加工图的建立与热辗扩成形工艺

陈慧琴;柏金鑫;齐会萍;付建华;李永堂   

  1. 太原科技大学材料科学与工程学院
  • 发布日期:2014-08-20

Establishment of Hot Processing Maps and Hot Ring Rolling Process of 42CrMo Steel

CHEN Huiqin;BAI Jinxin;QI Huiping;FU Jianhua;LI Yongtang   

  1. School of Material Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024
  • Published:2014-08-20

摘要: 以铸态42CrMo 钢为研究对象,通过分析其热压缩应力-应变曲线,计算建立该钢不同应变时的热加工图。应变较小的热加工图中,微观组织演变机制在1 100~1 150 ℃、0.1~1 s1范围为动态再结晶,在950~1 050 ℃、1~10 s1范围内为动态回复;随着应变的增大,动态回复和再结晶发生的温度和应变速率范围扩大,从而确定该钢最佳热辗扩温度和应变速率范围。结合该钢环形铸坯的热辗扩工艺试验,分析辗扩比、驱动辊速度和芯辊进给速度对辗扩件质量的影响,以及辗扩工艺参数对环件内部微观组织演变和最终晶粒组织的影响。分析结果和辗扩试验环件的检测结果都表明,用该钢环形铸坯直接进行辗扩成形生产环形零件,不仅可以获得精确的形状尺寸,而且可使环形铸坯得到充分变形,改善铸态组织、细化晶粒,获得内部微观组织和力学性能满足要求的环件。

关键词: 铸态42CrMo钢;热加工图;热辗扩;微观组织;工艺参数

Abstract: Taking as-cast 42CrMo steel as deformation material, hot processing maps at different strains are established by analyses stress-strain curves during hot compression and corresponding calculation. In the hot processing map of the smaller strain, dynamic recrystallization occurs in the temperature range of 1 100-1 150 ℃ and strain rate range of 0.1-1 s1, and dynamic recovery dominants in the temperature range of 950-1 050 ℃ and strain rate range of 1-10 s1. The temperature and strain rate range for dynamic recovery and recrystallization become lager when strain increases. The optimum temperature and strain rate ranges for hot ring rolling at different strain of the steel are determined according to the hot processing maps. Based on the hot ring-rolling process test of the as-cast ring blank of the steel, the influences of the deformation ratio, the rotational speed of the driving roll and the feet speed of the pressure roll on the quality of ring-rolled parts are analyzed. And the influence of ring-rolling parameters on microstructure evolution and grains in ring-rolled parts is also analyzed. The results both of analyses and the hot ring rolling test show that the ring rolling process with the as-cast ring-blank can not only produce ring parts with perfect shape and accurate size, but also make the as-cast ring-blank get deformation large enough improve cast structures and refine grains to meet microstructure and mechanical property requirements of ring parts.

Key words: as-cast 42CrMo steel;hot processing map;hot ring rolling;microstructure;process parameters

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