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过程工程学报 ›› 2019, Vol. 19 ›› Issue (3): 581-588.DOI: 10.12034/j.issn.1009-606X.218272

• 过程与工艺 • 上一篇    下一篇

电渣重熔结晶器旋转对M2高速钢凝固过程的影响

陈佳顺, 常凯华, 郑福舟, 张 章, 常立忠*   

  1. 安徽工业大学冶金工程学院,安徽 马鞍山 243032
  • 收稿日期:2018-08-13 修回日期:2018-10-26 出版日期:2019-06-22 发布日期:2019-06-20
  • 通讯作者: 常立忠 clz1997@163.com
  • 基金资助:
    国家自然科学基金;安徽省高校优秀青年人才支持计划

Effect of electroslag remelting mould rotation on solidification process of M2 high speed steel

Jiashun CHEN, Kaihua CHANG, Fuzhou ZHENG, Zhang ZHANG, Lizhong CHANG?   

  1. School of Metallurgy Engineering, Anhui University of Technology, Ma?anshan, Anhui 243032, China
  • Received:2018-08-13 Revised:2018-10-26 Online:2019-06-22 Published:2019-06-20
  • Contact: CHANG Li-zhong clz1997@163.com

摘要: 研究了自行设计的结晶器可旋转的电渣炉的旋转速率对M2高速钢凝固过程的影响,采用双极串联?电渣重熔方法,对不同结晶器转速下所制M2高速钢的二次枝晶、冷却速率、渗透率和渣皮厚度进行统计、计算和分析。结果表明,随结晶器转速增大,M2高速钢中心和边部的枝晶被打碎,结晶器转速越快,枝晶破碎越明显。结晶器转速由0增至19 r/min,M2高速钢在中心和边部的平均二次枝晶间距分别减小19.47%和25.23%,平均冷却速率分别增大97.01%和148.06%,平均渗透率分别降低34.94%和44.04%。结晶器旋转能将渣皮厚度降低40.41%,渣壳厚度的方差由0.163降至0.003,渣皮变得均匀,增大了金属熔池向外传热,使金属熔池变浅;另一方面,M2高速钢枝晶破碎、平均二次枝晶间距减小和渗透率降低使M2高速钢在凝固过程中的偏析得到控制,因而结晶器旋转可提高M2高速钢的凝固质量。

关键词: 高速钢, 电渣重熔, 结晶器旋转, 凝固, 渣皮

Abstract: A new electroslag furnace with mould rotation was designed, and the effect of mould rotation speed on M2 high speed steel solidification process was studied. A double-electrode series-electroslag remelting method was used in the experiment, the secondary dendrite, cooling rate, permeability and slag thickness of M2 high speed steel prepared at different mould rotational speeds were analyzed, calculated and counted. The results showed that the dendrites of M2 high-speed steel at the center and the edge were broken with the increase of the mould rotational speed, and the faster speed of mould rotate, the dendrite was broken more obviously. When the mould rational speed was increased from 0 to 19 r/min, at center and edge of M2 high speed steel, the average secondary dendrite spacing decreased by 19.47% and 25.23%, and the permeability decreased by 34.94% and 44.04%, the average cooling rate increased by 97.01% and 148.06%, respectively. The mould rotation reduced the thickness of the slag skin by 40.41%, and the variance of the thickness of the slag skin was reduced from 0.163 to 0.003, and the slag skin became uniform. On the one hand, the slag skin became thinner and uniform, which increased the heat transfer of the molten metal pool to the mould, so that the molten metal pool became shallow, on the other hand, the dendrites were broken, the reduction of the average secondary dendrite spacing and the decrease of permeability of M2 high speed steel can control the segregation of M2 high-speed steel during solidification. The solidification quality of the M2 high speed steel was improved by mould rotation.

Key words: High speed steel, electroslag remelting, Mould rotation, slag skull