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 ›› 2015, Vol. 36 ›› Issue (2): 48-51.

• 组织和性能 • 上一篇    下一篇

冷却速度对0.45C钢铸坯夹杂物和组织的影响

张庆军1,吴耀光3,崔志敏1,朱立光2   

  1. 1. 河北联合大学1分析测试中心;
    2. 冶金与能源学院,唐山063009;
    3. 河北钢铁集团石钢公司炼钢厂,石家庄 050031;
  • 收稿日期:2014-10-23 出版日期:2015-04-01 发布日期:2022-08-23
  • 作者简介:张庆军(1965-),男,博士(河北工业大学),河北师范大学(本科)毕业,材料细晶化、氧化物冶金研究。
  • 基金资助:
    河北省自然科学基金项目资助(E2013209207)

Effect of Cooling Rate on Inclusions and Structure of 0.45C Steel Casting Billet

Zhang Qingjun1 , Wu Yaoguang3 , Cui Zhimin1 , Zhu Liguang2   

  1. 1. Center of Analysis and Test;
    2. College of Metallurgy and Energy Sources, Hebei United University, Tangshan 063009;
    3. Steelworks, Shijiazhuang Steel Co, Hebei Iron and Steel Group, Shijiazhuang 050031;
  • Received:2014-10-23 Published:2015-04-01 Online:2022-08-23

摘要: 借助控制冷却速度的高温激光共聚焦显微镜,结合光学显微镜和扫描电镜、能谱分析仪研究1150℃至500℃时,冷却速度100~10℃/min对0.45C钢铸坯中夹杂物的属性、诱发晶内铁素体形核行为的影响。结果表明,随冷却速度减小,高熔点夹杂物基本没有变化,低熔点夹杂物的数量和尺寸有增加的趋势,尤其是钒的碳氮化物数量增加明显;随冷却速度降低,析出的晶内铁素体的数量增加,平均粒径增大,铁素体比例先增加后减小。当30℃/min连续冷却时,钢中夹杂物尺寸小于10μm比例高达93%,铁素体平均粒径为9.2μm,铁素体面积比例达30.2%。

关键词: 0.45C钢, 铸坯, 冷却速度, 夹杂物, 晶内铁素体, 组织

Abstract: The effect of cooling rate 100-10 °C/min from 1150 °C to 500 °C on attribute of inclusions and behavior of inducing intragranular ferrite nucleation in 0.45C steel casting billet has been studied by using high temperature confocal superpower laser-beam microscope to control cooling rate combined with optical, scanning electron microscope and energy dispersive spectrometer. Results show that with decreasing cooling rate the high melting-point inclusions in steel basically no-change while the low melting-point inclusions size and amount in steel trend towards increasing, especially the amount of vanadium carbo-nitride increases obviously; with decreasing cooling rate the amount of precipitated intragranular ferrite increases ,the average grain size increases and the ferrite ratio first increases and afterwards decreases. As continuous cooling with 30 Y/min, the ratio of size of inclusions in steel less than 10 μm is up to 93% , the average size of ferrite is 9.2 μm and the dimensions ratio of ferrite is 30.2%.

Key words: 0.45C Steel, Casting Billet, Cooling Rate, Inclusions, Intragranular Ferrite, Structure