成分变化对非调质钢硫化物析出的热力学分析

摘要/Abstract

摘要： 利用Thermo-Calc/DICTRA热力学和动力学软件计算了成分变化对非调质钢C38N2中硫化物析出的影响。计算得到，C、Si、Al含量的增加使得非调质钢中MnS的初始析出温度降低，其中C含量变化对其析出温度影响最为明显，Al含量的变化对MnS初始析出温度影响非常小，Si含量变化的影响则介于两者之间。Mn含量的变化对MnS相平衡析出有较大影响，随着Mn含量的增加，MnS的开始析出温度也跟着增加，并且能促进高温区MnS的析出。N含量变化对MnS开始析出温度影响非常小，但随着N含量的增加，可以促进高温区MnS的析出，不过当w(N)含量增加到一定程度时（0.015 %），对MnS析出行为不会再有影响。Nb和V含量的改变对非调质钢中MnS析出热力学几乎没有影响，并且第二相开始析出温度都低于MnS开始析出温度。但是，Ti对非调质钢中MnS析出有着较大的影响，当w(Ti)达到0.01 %时，TiN开始析出温度大于MnS开始析出温度，使得微合金第二相TiN先于MnS析出，且w(Ti)>0.02 %时，会抑制高温区MnS的析出。此现象也解释了非调质钢中存在以（Nb、Ti）N为核心MnS夹杂的原因。

关键词: 非调质钢, 硫化物, 热力学, Thermo-Calc/DICTRA

Abstract: The effects of compositional changes on the precipitation of sulfides in non-quenched and tempered steel C38N2 were calculated by Thermo-Calc/DICTRA thermodynamics and kinetics software. It is calculated that the increase of C, Si and Al content can reduce the initial precipitation temperature of MnS in non-quenched and tempered steel. Among them, the change of C content has the most obvious influence on the precipitation temperature, the change of Al content has little effect on the initial precipitation temperature of MnS, and the effect of Si content change on the initial precipitation temperature of MnS is between C and Al. The change of Mn content has a great influence on the equilibrium precipitation of MnS phase. With the increase of Mn content, the precipitation temperature of MnS also increases, and the precipitation of MnS in high temperature zone can be promoted. The change of N content has little effect on the precipitation temperature of MnS, but with the increase of N content, it can promote the precipitation of MnS in high temperature zone. However, when the N mass fraction is increased to a certain extent (0.015%), the change in the N content does not affect the precipitation behavior of MnS. The change in Nb and V content has little effect on the thermodynamics of MnS precipitation in non-quenched and tempered steel, and the initial precipitation temperature of the second phase is lower than the initial precipitation temperature of MnS. However, Ti has a great influence on the precipitation of MnS in non-quenched and tempered steel. When the Ti mass fraction reaches 0.01%, the initial precipitation temperature of TiN is higher than the initial precipitation temperature of MnS, so that TiN is precipitated earlier than MnS. When the Ti mass fraction is more than 0.02%, Ti will suppress the precipitation of MnS in the high temperature region. And this phenomenon also explains the presence of MnS inclusions with (Nb, Ti)N as the core in non-quenched and tempered steel.

Key words: non-quenched and tempered steel, sulfide, thermodynamics, Thermo-Calc/DICTRA

王喆1，吴华杰1，姚登元2. 成分变化对非调质钢硫化物析出的热力学分析[J]. 炼钢.

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成分变化对非调质钢硫化物析出的热力学分析

Thermodynamic analysis of elemental composition change on the precipitation of sulfides in non-quenched and tempered steel

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