奥氏体化参数对25Cr3Ni3MoNb钢700 ℃下变形行为的影响

doi:10.13251/j.issn.0254-6051.2023.05.032

金属热处理 ›› 2023, Vol. 48 ›› Issue (5): 210-216.DOI: 10.13251/j.issn.0254-6051.2023.05.032

奥氏体化参数对25Cr3Ni3MoNb钢700 ℃下变形行为的影响

林雄¹, 满达¹, 杨宏韬¹, 侯宇辰¹, 金自力^1,3, 李玮^2,3

1.内蒙古科技大学材料与冶金学院, 内蒙古包头 014010;
2.内蒙古科技大学分析测试中心, 内蒙古包头 014010;
3.内蒙古科技大学白云鄂博共伴生矿资源高效综合利用省部共建协同创新中心, 内蒙古包头 014010

收稿日期:2022-11-11 修回日期:2023-03-09 出版日期:2023-05-25 发布日期:2023-06-21
通讯作者: 李玮,讲师,博士,E-mail: liwei_imust@126.com
作者简介:林雄(1995—),男,硕士研究生,主要研究方向为钢铁材料组织性能,E-mail: 379540084@qq.com。
基金资助:
内蒙古自治区科技计划(2021GG0141);军民融合产业发展转移支付专项基金产业示范引导项目(JMRHZX20210009)

Effect of austenitizing parameters on deformation behavior of 25Cr3Ni3MoNb steel at 700 ℃

Lin Xiong¹, Man Da¹, Yang Hongtao¹, Hou Yuchen¹, Jin Zili^1,3, Li Wei^2,3

1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. Instrumental Analysis Centre,Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
3. Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China

Received:2022-11-11 Revised:2023-03-09 Online:2023-05-25 Published:2023-06-21

摘要/Abstract

摘要： 以速射火炮身管用钢25Cr3Ni3MoNb钢为对象,通过分析25Cr3Ni3MoNb钢的组织特征与析出行为,对700 ℃下的变形行为进行了详细的研究,探索材料微观结构对700 ℃高温力学性能的影响。结果表明,700 ℃的变形过程中,25Cr3Ni3MoNb钢存在加工硬化与动态软化相互竞争的关系,同时25Cr3Ni3MoNb钢的奥氏体化温度与700 ℃变形行为存在密切联系,并最终影响材料的力学性能。当奥氏体化温度从980 ℃提高至1020 ℃时,材料内部的缺陷密度降低,回火后,析出物尺寸增大,700 ℃拉伸时,抗拉强度R_m由354 MPa降至237 MPa,屈服强度R_p0.2由312 MPa降低至221 MPa。经过980 ℃奥氏体化后,25Cr3Ni3MoNb钢表现出更大的加工硬化率和更小的动态软化率,这是由于980 ℃奥氏体化的试验钢板条内部存在更多的碳化物钉扎位错,使得动态回复更难发生,从而表现出高的屈服强度。

关键词: 火炮身管用钢, 奥氏体化温度, 高温强度, 析出物

Abstract: By analyzing the microstructure characteristics and precipitation behavior of 25Cr3Ni3MoNb steel for rapid-fire gun barrel, the deformation behavior at 700 ℃ was studied in detail, and the influence of material microstructure on high temperature mechanical properties at 700 ℃ was explored. The results show that there is a competitive relationship between work hardening and dynamic softening during the deformation process at 700 ℃. Meanwhile, the deformation behavior of the 25Cr3Ni3MoNb steel at 700 ℃ is closely related to the austenitizing temperature, and ultimately affects the mechanical properties of the material. As the austenitizing temperature increases from 980 ℃ to 1020 ℃, the density of defects in the material decreases. After tempering, the size of precipitates increases. Then tension at 700 ℃, the tensile strength R_m decreases from 354 MPa to 237 MPa, and the yield strength R_p0.2 decreases from 312 MPa to 221 MPa. The specimen austenitized at 980 ℃ exhibits a greater work hardening rate and smaller dynamic softening rate, because the volume fraction of carbides pinning dislocations are more inside the specimen. The pinning effect also makes the process of dynamic recovery more difficult and thus exhibits higher high-temperature yield strength.

Key words: gun barrel steel, austenitizing temperature, high-temperature strength, precipitation

中图分类号:

TG156.3

林雄, 满达, 杨宏韬, 侯宇辰, 金自力, 李玮. 奥氏体化参数对25Cr3Ni3MoNb钢700 ℃下变形行为的影响[J]. 金属热处理, 2023, 48(5): 210-216.

Lin Xiong, Man Da, Yang Hongtao, Hou Yuchen, Jin Zili, Li Wei. Effect of austenitizing parameters on deformation behavior of 25Cr3Ni3MoNb steel at 700 ℃[J]. Heat Treatment of Metals, 2023, 48(5): 210-216.

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奥氏体化参数对25Cr3Ni3MoNb钢700 ℃下变形行为的影响

Effect of austenitizing parameters on deformation behavior of 25Cr3Ni3MoNb steel at 700 ℃

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