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金属学报  2020, Vol. 56 Issue (5): 704-714    DOI: 10.11900/0412.1961.2019.00288
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基于Ce变质处理的TWIP钢凝固组织细化
李根, 兰鹏(), 张家泉
北京科技大学冶金与生态工程学院 北京 100083
Solidification Structure Refinement in TWIP Steel by Ce Inoculation
LI Gen, LAN Peng(), ZHANG Jiaquan
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
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摘要: 

通过真空感应熔炼制备了成分为Fe-22Mn-0.65C的奥氏体TWIP钢,揭示了Ce含量及过热度对TWIP钢凝固组织细化的影响。基于FactSage 7.0热力学软件及错配度模型预测了Ce在TWIP钢中的变质产物及其非均质形核有效性,采用OM、SEM、EBSD、EPMA等手段对不同条件下凝固组织变质处理效果进行定量研究。结果表明,随Ce含量升高,其在TWIP钢中的反应产物由Ce2O3向Ce2O3+少量Ce2O2S转变,而2种粒子理论上均可作为有效形核核心;Ce变质处理后,TWIP钢试样铸态组织等轴晶率从25%升至72%,等轴晶平均尺寸由480 μm减小到130 μm,Mn元素偏析比由1.61降至1.41;降低变质处理温度时,含Ce粒子团聚倾向减小,TWIP钢凝固组织细化的效果更显著。本工作中建议的变质处理参数为过热度20 ℃时加入(0.02%~0.04%)Ce。

关键词 CeTWIP钢变质处理凝固组织细化显微偏析    
Abstract

Twinning-induced plasticity (TWIP) steel represents a novel grade of advanced high strength and ductility with significant potential for automotive industry. However, high alloying in TWIP steel leads to the inhomogeneous solute distribution and anisotropic local deformation. It is well known that the refinement of solidification structure is an effective solution to the above defects. Much attention has been paid to heterogeneous nucleation by Ce particles, acting as nucleating sites in liquid steel. The present work focuses on how Ce content and casting parameters affect the refinement of solidification structure in Fe-22Mn-0.65C TWIP steel, aiming to provide an effective technology in high alloy steel production. The reaction products of Ce inoculation were predicted by thermodynamics software FactSage 7.0 and their effectiveness of heterogeneous nucleation was estimated by lattice misfit model. The solidification structure refinement by Ce inoculation under different conditions was experimentally studied by OM, SEM, EBSD and EPMA. The results show that, with increasing Ce content the reaction products transferred from Ce2O3 to Ce2O3+a small amount of Ce2O2S, and both kinds of particles can act as heterogeneous nucleation cores theoretically. For as-cast solidification structure, the ratio of equiaxed grain area increased from 25% to 72%, average equiaxed grain size decreased from 480 μm to 130 μm and the segregation ratio of Mn decreased from 1.61 to 1.41. Meanwhile, the tendency of particle agglomeration was weakened by lowering inoculation temperature, resulting in the improvement structure refinement. In this work, the recommended inoculation parameters are concluded as (0.02%~0.04%)Ce with superheat of 20 ℃.

Key wordsCe    TWIP steel    inoculation    solidification structure refinement    micro-segregation
收稿日期: 2019-09-02     
ZTFLH:  TF771.1  
基金资助:国家自然科学基金项目(51604021);中央高校基本科研业务费专项基金项目(FRF-TP-19-017A3)
通讯作者: 兰鹏     E-mail: lanpeng@ustb.edu.cn
Corresponding author: LAN Peng     E-mail: lanpeng@ustb.edu.cn
作者简介: 李 根,男,1995年生,博士生

引用本文:

李根, 兰鹏, 张家泉. 基于Ce变质处理的TWIP钢凝固组织细化[J]. 金属学报, 2020, 56(5): 704-714.
Gen LI, Peng LAN, Jiaquan ZHANG. Solidification Structure Refinement in TWIP Steel by Ce Inoculation. Acta Metall Sin, 2020, 56(5): 704-714.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00288      或      https://www.ams.org.cn/CN/Y2020/V56/I5/704

图1  铸模、铸锭及加工方式示意图

T

Superheat

Sample

No.

Mass fraction / %
CeCe yield
145050H00
145050H10.01013
145050H20.03416
145050H30.06425
142020L00
142020L10.01314
142020L20.02210
142020L30.06223
表1  孪晶诱导塑性(TWIP)钢试样的化学成分
图2  过热度50 ℃时Ce在TWIP钢中的变质处理产物
PhaseCrystal systema / nmc / nmα / (10-6-1)Caseδ / %
γ-Fefcc0.3620-25--
Ce2O3hex0.38910.606310(0001)Ce2O3//(100)γ-Fe6.2
(0001)Ce2O3//(100)γ-Fe21.0
(0001)Ce2O3//(100)γ-Fe19.5
Ce2O2Shex0.40010.683010(0001)Ce2O2S//(100)γ-Fe5.2
(0001)Ce2O2S//(100)γ-Fe24.7
(0001)Ce2O2S//(100)γ-Fe21.1
表2  Ce变质处理产物与TWIP钢凝固相间错配度[24,25,26,27]
图3  Ce变质处理产物与TWIP钢凝固相最低错配度晶面间的晶体学关系
图4  Ce变质处理对TWIP钢试样凝固组织的影响(白色实线为CET位置)
图5  Ce含量对TWIP钢试样CET位置与表面距离及等轴晶率的影响
图6  TWIP钢试样中心等轴晶区EBSD像
图7  Ce含量对TWIP钢试样等轴晶平均尺寸的影响
图8  TWIP钢变质处理试样中典型粒子SEM像及EDS分析
图9  TWIP钢变质处理试样中粒子三维尺寸分布的对数-正态概率分布图

Superheat

Fitting result
ABR2
501.35×1067.760.96
202.10×10634.340.99
表3  TWIP钢变质处理试样中粒子总数与Ce含量间拟合结果
图10  Ce变质处理对TWIP钢试样Mn显微偏析的影响
图11  Ce含量对TWIP钢试样Mn元素偏析比的影响
图12  钢中常见粒子与奥氏体相间的错配度、标准Gibbs生成能与密度[31,32,33,34,35,36,37]
图13  Ce变质处理对TWIP钢试样凝固织构的影响
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