金属热处理 ›› 2022, Vol. 47 ›› Issue (9): 108-112.DOI: 10.13251/j.issn.0254-6051.2022.09.019

• 工艺研究 • 上一篇    下一篇

高强韧工程机械用钢Q690D的淬火工艺优化

季德静1, 杨维宇2, 白雅琼3   

  1. 1.吉林电子信息职业技术学院 冶金研究所, 吉林 吉林 132021;
    2.内蒙古包钢稀土钢板材有限责任公司 研发中心, 内蒙古 包头 014010;
    3.内蒙古包钢钢联股份有限公司 技术中心, 内蒙古 包头 014010
  • 收稿日期:2022-04-26 修回日期:2022-07-15 发布日期:2022-10-18
  • 作者简介:季德静(1983—),女,副教授,学士,主要研究方向为冶金、材料专业科研与教学工作,E-mail:122811253@qq.com

Optimization of quenching process of high strength and toughness Q690D steel for construction machines

Ji Dejing1, Yang Weiyu2, Bai Yaqiong3   

  1. 1. Metallurgical Research Institute, Jilin Technology College of Electronic Information, Jilin Jilin 132021, China;
    2. Research Center, Inner Mongolia Baotou Steel Rare Rarth Steel Plate Co. , Ltd. , Baotou Inner Mongolia 014010, China;
    3. Technical Center, Inner Mongolia Baotou Steel Union Co. , Ltd. , Baotou Inner Mongolia 014010, China
  • Received:2022-04-26 Revised:2022-07-15 Published:2022-10-18

摘要: 通过全自动相变仪、光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)等,研究880~1100 ℃淬火温度对30 mm厚Q690D钢显微组织、原始奥氏体晶粒尺寸、-20 ℃低温冲击性能和冲击断口形貌的影响。结果表明,当淬火温度低于950 ℃时,试验钢奥氏体平均晶粒尺寸小于10 μm,随着淬火温度的升高,Nb、V、Ti微合金碳化物溶入奥氏体量增加,-20 ℃低温冲击吸收能量逐渐升高;当淬火温度由950 ℃升高至1100 ℃,随着奥氏体晶粒快速长大,试验钢-20 ℃冲击吸收能量由最大值150 J降低至19 J;Q690D钢的最佳淬火工艺为950 ℃×20 min,水冷。

关键词: Q690D钢, 淬火温度, 奥氏体晶粒, 显微组织, 冲击性能

Abstract: Effect of quenching temperature from 880 ℃ to 1100 ℃ on microstructure, original austenite grain size and impact property at -20 ℃ of the Q690D steel with 30 mm thickness was investigated by means of full-automatic phase transition equipment, optical microscope, scanning electron microscope and transmission electron microscope. The results show that when the quenching temperature is below 950 ℃, the average austenite grain size of the tested steel is less than 10 μm, with the increase of quenching temperature, the Nb, V, Ti microalloyed carbides dissolve and the impact absorbed energy at -20 ℃ increases gradually. When the quenching temperature increases from 950 ℃ to 1100 ℃, the impact absorbed energy at -20 ℃ of the tested steel decreases from the maximum value 150 J to 19 J, with the rapid growth of austenite grains. The optimum quenching process of the Q690D steel is 950 ℃×20 min, and then water cooling.

Key words: Q690D steel, quenching temperature, austenite grain, microstructure, impact property

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