ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2012, Vol. 33 ›› Issue (4): 57-60.

• 组织和性能 • 上一篇    下一篇

等温温度对低碳齿轮钢带状组织的影响

蔡珍1,黄运华2,张跃尊1,2,周立新3,陈长西3,李博鹏3   

  1. 北京科技大学1新金属材料国家重点实验室;2材料科学与工程学院,北京100083;
    3湖北新冶钢有限公司,黄石435001
  • 收稿日期:2012-01-26 出版日期:2012-08-01 发布日期:2022-10-25
  • 通讯作者: 通讯作者:黄运华,教授,北京科技大学材料科学与工程学院,北京100083
  • 作者简介:蔡珍(1987-),女,硕士研究生,2009年武汉科技大学毕 业,特殊钢带状组织研究。
  • 基金资助:
    国家自然科学基金项目资助(51172022)

Effect of Isothermal Temperature on Banded Structure in Low Carbon Gear Steel

Cai Zhen1, Huang Yunhua2, Zhang Yue1,2, Zhou Lixin3, Chen Changxi3,Li Bopeng3   

  1. 1 State Key Laboratory for Advanced Metals and Materials, 2 School of Material Science and Technology,
    University of Science and Technology, Beijing 100083 ; 3 Hubei Xinyesteel Corp Ltd, Huangshi 435001
  • Received:2012-01-26 Published:2012-08-01 Online:2022-10-25

摘要: 通过计算铁素体形核孕育期和形核率探讨了等温温度对带状组织的影响机理,并观察了齿轮钢SAE8822H(/%:0.22C、0.20Si、0.98Mn、0.60Cr、0.46Ni、0.36Mo)在管式炉经930℃10 min降至703~579℃等温1h空冷,或710~570℃等温处理2 h炉冷后钢中带状组织演变。结果表明,贫、富溶质区铁素体形核孕育时间差和铁素体形核率差异是造成等温转变时产生带状的原因;等温温度降低时,贫、富溶质区的孕育期时间差缩短,相对形核率减少,带状减轻;齿轮钢SAE8822H在570℃等温可使带状组织消失,这时相对形核率为6.3%。

关键词: 齿轮钢, 带状组织, 等温温度, 孕育期时间差, 相对形核率

Abstract: The mechanism of effect of isothermal temperature on banded structure is delved by calculation of ferrite incubation period and nucleation rate, and the evolution of banded structure in sample of gear steel SAE8822H (/% : 0. 22C, 0. 20Si, 0. 98Mn, 0. 60Cr, 0. 46Ni, 0. 36Mo) heated in tube furnace at 930 ℃ for 10 min and isothermal-treated at 703 -579 ℃ for 1 h, air cooling, or isothermal-treated at 710 ~ 570℃ for 2 h, furnace cooling is observed. Results show that the difference of incubation period and difference of nucleation rate of ferrite between solute-depleted zone and solute-richened zone are the causes to produce banded structure ; with decreasing the isothermal temperature, the difference of incubation period between solute-depleted and solute-richened zone reduces and the relative nucleation rate also decreases, lead to relieving the banded structure of steel; for steel SAE8822H, isothermal treatment at 570 ℃ is available to e- laminate banded structure, in this case the relative nucleation rate is 6.3%.