Nb对0.2C-1.5Si-1.8Mn淬火配分钢组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.03.015

金属热处理 ›› 2020, Vol. 45 ›› Issue (3): 73-77.DOI: 10.13251/j.issn.0254-6051.2020.03.015

Nb对0.2C-1.5Si-1.8Mn淬火配分钢组织和力学性能的影响

詹华¹, 冷德平¹, 潘红波², 肖洋洋¹, 刘永刚¹, 曹京华³

1. 马鞍山钢铁股份有限公司技术中心, 安徽马鞍山 243000;
2. 安徽工业大学工程研究院, 安徽马鞍山 243000;
3. 安徽工业大学冶金工程学院, 安徽马鞍山 243000

收稿日期:2019-09-13 出版日期:2020-03-25 发布日期:2020-04-03
通讯作者: 潘红波,教授,博士,主要从事高强钢的强韧化机制与组织性能控制研究,E-mail:panhb718@163.com
作者简介:詹华(1980—),男,高级工程师,硕士,主要从事汽车用钢组织及性能控制研究,E-mail:cquzhanhua@163.com。
基金资助:
国家自然科学基金(U1860105,51774006);安徽省自然科学基金(1708085ME116)

Influence of Nb on microstructure and mechanical properties of 0.2C-1.5Si-1.8Mn quenching and partitioning steel

Zhan Hua¹, Leng Deping¹, Pan Hongbo², Xiao Yangyang¹, Liu Yonggang¹, Cao Jinghua³

1. Technology Center, Ma'anshan Iron and Steel Company, Ma'anshan Anhui 243000, China;
2. Engineering Research Institute, Anhui University of Technology, Ma'anshan Anhui 243000, China;
3. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243000, China

Received:2019-09-13 Online:2020-03-25 Published:2020-04-03

摘要/Abstract

摘要：

在C-Si-Mn系传统Q&P钢的基础上,通过适当添加微合金元素Nb,探讨了微合金元素Nb对淬火配分钢组织性能的影响。结果表明,无Nb钢与加Nb钢的显微组织基本相同,均由铁素体、板条马氏体与M/A岛组成,但加Nb钢马氏体板条明显细化,板条间距明显减小。Nb促进铁素体析出并抑制珠光体生成,Nb的加入有效细化了组织,缩短了C配分距离,有利于碳向奥氏体中扩散,增加奥氏体的稳定性。经相同Q&P工艺处理后含Nb试验钢的屈服强度、抗拉强度均有所提高,其抗拉强度达989.07 MPa,伸长率为18.36%,强塑积为18.16 GPa·%。

关键词: 淬火配分钢, 微合金元素Nb, 组织, 扩散, 力学性能

Abstract:

Based on traditional C-Si-Mn Q&P steel, the influence of niobium (Nb) on microstructure and properties of quenching-partitioning steel (Q&P) was investigated by adding moderate microalloying element Nb. The results show that the microstructure of the Nb-added steel consists of ferrite, lath martensite and M/A island, basically being the same as that of Nb-free steel. However, the martensite lath of the Nb-added steel is obviously refined, and the inter-lath spacing is significantly reduced. The addition of Nb promotes the precipitation of ferrite, inhibits the formation of pearlite, thus effectively refines the microstructure and shortens the carbon partitioning distance, facilitates the diffusion of carbon into austenite and increases the stability of austenite. The yield strength and tensile strength of the Nb-added steel are improved after the same Q&P heat treatment, with the tensile strength and elongation reaching to 989.07 MPa and 18.36% respectively, the production of tensile strength and plasticity reaching up to 18.16 GPa·%.

Key words: quenching and partitioning steel, microalloying element Nb, microstructure, diffusion, mechanical properties

中图分类号:

TG142.1

詹华, 冷德平, 潘红波, 肖洋洋, 刘永刚, 曹京华. Nb对0.2C-1.5Si-1.8Mn淬火配分钢组织和力学性能的影响[J]. 金属热处理, 2020, 45(3): 73-77.

Zhan Hua, Leng Deping, Pan Hongbo, Xiao Yangyang, Liu Yonggang, Cao Jinghua. Influence of Nb on microstructure and mechanical properties of 0.2C-1.5Si-1.8Mn quenching and partitioning steel[J]. HTM, 2020, 45(3): 73-77.

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Nb对0.2C-1.5Si-1.8Mn淬火配分钢组织和力学性能的影响

Influence of Nb on microstructure and mechanical properties of 0.2C-1.5Si-1.8Mn quenching and partitioning steel

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