合金弹簧钢51CrV4中镁铝尖晶石夹杂行为研究

炼钢 ›› 2017, Vol. 33 ›› Issue (6): 57-61.

合金弹簧钢51CrV4中镁铝尖晶石夹杂行为研究

张波1,2，彭明耀2，曾斌2，周春泉2，郭政伟2，王大萍1，刘浪1

1.湖南工业大学冶金与材料工程学院，湖南株洲 412007； 2.湖南华菱涟源钢铁公司技术中心，湖南娄底 417000

接受日期:1900-01-01 出版日期:2017-12-05

Research on MgO·Al2O3 spinel inclusions in alloy spring steel 51CrV4

Accepted:1900-01-01 Online:2017-12-05

摘要/Abstract

摘要： 针对冶炼合金弹簧钢51CrV4过程存在大量MgO·Al2O3类夹杂的问题，采用现场取样及扫描电镜和能谱分析等手段，对51CrV4钢冶炼过程中夹杂物的转变过程进行研究，分析了冶炼过程中MgO·Al2O3夹杂的来源和生成过程，并对采用钙处理对钢中镁铝尖晶石改性行为的可行性进行了探讨。研究结果表明：51CrV4冶炼过程中，当钢中w(Mg)=(0.55～30.6)×10-6时均能生成MgO·Al2O3夹杂。而当钢中w(Ca)达到6×10-6时，MgO·Al2O3夹杂出现液态复合夹杂物，并随着钢中[Ca]含量的提高液态复合夹杂物含量快速增加，而尖晶石夹杂含量减小。当钢中w(Ca)达到35×10-6左右时，MgO〖·Al2O3夹杂完全转变为液态。

关键词: 合金弹簧钢, 镁铝尖晶石, 夹杂物行为

Abstract: Aiming at the problem of non-metallic inclusions in smelting process, the transformation of inclusions in refining process of alloy spring steel 51CrV4 was studied by sample analysis, SEM and EDS. The origination and formation of MgO·Al2O3 spinel inclusions was analyzed, and the feasibility of inclusion modification by calcium treatment was discussed. The results showed that MgO·Al2O3 spinel inclusions could generate when [Mg] mass fraction between (0.55－30.6)×10-6, and start converted into liquid when [Ca] mass fraction reached 6×10-6. The liquid inclusions content increased rapidly with the improvement of [Ca] content in the steel, and the conversion could be completed when [Ca] mass fraction in the steel reached around 35×10-6.

Key words: alloy spring steel, MgO·Al2O3 spinel inclusions, inclusion behavior

张波1,2，彭明耀2，曾斌2，周春泉2，郭政伟2，王大萍1，刘浪1. 合金弹簧钢51CrV4中镁铝尖晶石夹杂行为研究[J]. 炼钢, 2017, 33(6): 57-61.

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