稀土钇对H13钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2023.05.012

金属热处理 ›› 2023, Vol. 48 ›› Issue (5): 70-77.DOI: 10.13251/j.issn.0254-6051.2023.05.012

稀土钇对H13钢组织与性能的影响

舒瑞熙, 杨忠民, 曹燕光, 李昭东, 陈颖, 王慧敏

钢铁研究总院有限公司工程用钢研究院, 北京 100081

收稿日期:2022-11-28 修回日期:2023-03-18 出版日期:2023-05-25 发布日期:2023-06-21
通讯作者: 杨忠民,正高级工程师,博士,E-mail: yangzm2005@126.com
作者简介:舒瑞熙(1997—),男, 硕士研究生,主要研究方向为交通与建筑用钢,E-mail: 1132189571@qq.com。
基金资助:
江西省重点研发计划重点项目(20192ACB50010)

Effect of rare earth Y on microstructure and properties of H13 steel

Shu Ruixi, Yang Zhongmin, Cao Yanguang, Li Zhaodong, Chen Ying, Wang Huimin

Institute of Structural Steels, Central Iron and Steel Research Institute Compamy Limited, Beijing 100081, China

Received:2022-11-28 Revised:2023-03-18 Online:2023-05-25 Published:2023-06-21

摘要/Abstract

摘要： 研究了不同稀土Y含量对H13模具钢组织和性能的影响。实验室采用电渣重熔冶炼获得了稀土Y的质量分数分别为0.0008%、0.0060%和0.0120%的H13钢电渣锭。利用OM、SEM、TEM和热力学计算等方法研究稀土Y对组织的影响;利用冲击试验机和显微硬度计探究了稀土Y对性能的影响。结果表明,稀土Y使H13钢中的隐晶马氏体的形貌变成狗骨状,随着稀土Y含量的增加,隐晶马氏体呈局部细小和弥散分布趋势;H13钢中凝固终点处残留液相中元素的浓度达到高碳高合金钢的浓度,导致液析碳化物生成。稀土Y的质量分数为0.0120%时,钢中C元素的偏析度由1.292降低至0.529,合金元素Cr、Mo、V的偏析度也均有降低;钢中5 μm以上的碳化物占比最低,碳化物的平均尺寸为3.13 μm;钢热处理后的横向冲击吸收能量为19.5 J,退火和回火后的维氏硬度分别为244.4和525.5 HV0.5。

关键词: 稀土钇, H13钢, 碳化物, 偏析, 性能

Abstract: Effect of different rare earth Y contents on microstructure and properties of H13 die steel was studied. The laboratory used electroslag remelting to obtain H13 steel electroslag ingots with rare earth Y mass fractions of 0.0008%, 0.0060%, and 0.0120%, respectively. The effect of rare earth Y on microstructure was studied by means of OM, SEM, TEM and thermodynamic calculation. The effect of rare earth Y on properties was investigated by using impact testing machine and microhardness tester. The results show that the morphology of cryptocrystalline martensite in the H13 steel changes into dog-bone shape with the addition of rare earth Y. With the increase of Y content, the cryptocrystalline martensites show a local fine and dispersed distribution trend. The concentration of elements in the retained liquid phase in the H13 steel at the solidification end point reaches the concentration of high carbon and high alloy steel, resulting in the formation of liquidus carbide. When the content of rare earth Y is 0.0120%, the segregation degree of C element in the steel decreases from 1.292 to 0.529, the segregation degree of alloy elements Cr, Mo and V also decreases; the proportion of carbides with size larger than 5 μm in the steel is the lowest, and the average size of carbides is 3.13 μm; the transverse impact absorbed energy of the steel after heat treatment is 19.5 J, and the Vickers hardness after annealing and tempering are 244.4 and 525.5 HV0.5, respectively.

Key words: rare earth yttrium, H13 steel, carbide, segregation, properties

中图分类号:

TG142

舒瑞熙, 杨忠民, 曹燕光, 李昭东, 陈颖, 王慧敏. 稀土钇对H13钢组织与性能的影响[J]. 金属热处理, 2023, 48(5): 70-77.

Shu Ruixi, Yang Zhongmin, Cao Yanguang, Li Zhaodong, Chen Ying, Wang Huimin. Effect of rare earth Y on microstructure and properties of H13 steel[J]. Heat Treatment of Metals, 2023, 48(5): 70-77.

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稀土钇对H13钢组织与性能的影响

Effect of rare earth Y on microstructure and properties of H13 steel

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