IQ&P工艺处理高强钢的组织性能及低温C配分

doi:10.13251/j.issn.0254-6051.2024.08.012

金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 74-81.DOI: 10.13251/j.issn.0254-6051.2024.08.012

IQ&P工艺处理高强钢的组织性能及低温C配分

王堤鹤^1,2, 庞启航¹, 赵星宇³, 李维娟¹, 赵立冬¹, 史津铭¹

1.辽宁科技大学材料与冶金学院, 辽宁鞍山 114051;
2.潞安化工机械(集团)有限公司, 山西太原 030032;
3.宝钢湛江钢铁有限公司, 广东湛江 524072

收稿日期:2024-02-06 修回日期:2024-06-25 出版日期:2024-08-25 发布日期:2024-09-27
通讯作者: 庞启航,副教授,博士,E-mail:qihang25@163.com
作者简介:王堤鹤(1996—),男,硕士,主要研究方向为高性能金属材料组织性能调控,E-mail:wdh960616@163.com。
基金资助:
国家自然科学基金(52004122)

Microstructure and properties of high strength steel treated by IQ&P process and low temperature C-partition

Wang Dihe^1,2, Pang Qihang¹, Zhao Xingyu³, Li Weijuan¹, Zhao Lidong¹, Shi Jinming¹

1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan Liaoning 114051, China;
2. Lu'an Chemical Machinery (Group) Co., Ltd., Taiyuan Shanxi 030032, China;
3. Baosteel Zhanjiang Iron and Steel Co., Ltd., Zhanjiang Guangdong 524072, China

Received:2024-02-06 Revised:2024-06-25 Online:2024-08-25 Published:2024-09-27

摘要/Abstract

摘要： 高强钢临界淬火-配分(IQ&P)处理时,低温配分阶段C元素向残留奥氏体偏聚,能够稳定残留奥氏体使其强塑性提升。对铁素体+珠光体(F+P)高强钢进行IQ&P处理,利用扫描电镜、拉伸试验机及多功能内耗仪对高强钢的组织、性能及低温配分阶段C元素配分进行了研究。结果表明,在高温配分阶段(两相区临界淬火,820 ℃保温240 s),组织逐步奥氏体化,随后淬火过程中生成了一次马氏体、M/A组织和碳化物等组织,其强塑积和残留奥氏体体积分数分别为14.4 GPa·%和5.65%。低温配分阶段(350 ℃保温300 s),高强钢生成回火马氏体,保留了M/A组织、残留奥氏体以及渗碳体,其强塑积和残留奥氏体体积分数分别为18.6 GPa·%和9.26%。低温配分阶段C原子分别与缺陷型、可动刃型位错相互作用,形成Snoke峰和SKK峰,使残留奥氏体体积分数增加,是高强钢强塑积提高的原因。

关键词: IQ&P工艺, 先进高强钢, 低温配分, 残留奥氏体, 力学性能, C配分

Abstract: During intercritical quenching and partitioning (IQ&P) treatment of high strength steel, element C tends to segregate towards retained austenite at low temperature partitioning stage, which can stabilize the retained austenite and improve its strength and plasticity. The ferrite+pearlite (F+P) high strength steel was subjected to IQ&P treatment. The microstructure, properties and C element partition of the high strength steel at low temperature were studied by means of scanning electron microscope, tensile testing machine and multi-function internal friction instrument. The results show that in the high temperature partitioning stage (two-phase intercritical quenching at 820 ℃ for 240 s), the microstructure is austenitized gradually, and then the martensite, M/A and carbide are formed during the quenching process. The product of strength and elongation and volume fraction of retained austenite are 14.4 GPa·% and 5.65%, respectively. During low temperature partitioning stage (at 350 ℃ for 300 s), tempered martensite is formed, M/A structure, retained austenite and cementite are retained. The product of strength and elongation and volume fraction of retained austenite are 18.6 GPa·% and 9.26%, respectively. C atoms interact with defect-type and movable edge dislocations at low temperature partitioning stage, forming Snoke peak and SKK peak, which increase the volume fraction of retained austenite and are the main reason for the improvement of the product of strength and elongation of the high strength steel.

Key words: IQ&P process, advanced high strength steel, low temperature partitioning, retained austenite, mechanical properties, C-partition

中图分类号:

TG142.1

王堤鹤, 庞启航, 赵星宇, 李维娟, 赵立冬, 史津铭. IQ&P工艺处理高强钢的组织性能及低温C配分[J]. 金属热处理, 2024, 49(8): 74-81.

Wang Dihe, Pang Qihang, Zhao Xingyu, Li Weijuan, Zhao Lidong, Shi Jinming. Microstructure and properties of high strength steel treated by IQ&P process and low temperature C-partition[J]. Heat Treatment of Metals, 2024, 49(8): 74-81.

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IQ&P工艺处理高强钢的组织性能及低温C配分

Microstructure and properties of high strength steel treated by IQ&P process and low temperature C-partition

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