新型二次硬化钢<strong>25CrMo3NiTiVNbZr</strong>的高温力学性能和强化机理

doi:10.11901/1005.3093.2023.516

材料研究学报

2024, Vol. 38

Issue (5): 390-400 DOI: 10.11901/1005.3093.2023.516

研究论文

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新型二次硬化钢25CrMo3NiTiVNbZr的高温力学性能和强化机理

李若浩¹, 胡霄雨², 王中成³, 李浩⁴, 杨勇⁴, 徐乐¹(

), 梁恩溥¹, 何肖飞¹

^1.钢铁研究总院有限公司特殊钢研究院北京 100081
^2.中国金属学会北京 100010
^3.内蒙古北方重工业集团有限公司包头 014010
^4.重庆长安望江工业集团有限公司重庆 400020

High-temperature Mechanical Properties and Strengthening Mechanism of New Secondary Hardened Steel 25CrMo3NiTiVNbZr

LI Ruohao¹, HU Xiaoyu², WANG Zhongcheng³, LI Hao⁴, YANG Yong⁴, XU Le¹(

), LIANG Enpu¹, HE Xiaofei¹

^1.Research Institite of Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China
^2.The Chinese Society for Metals, Beijing 100010, China
^3.Inner Mongolia North Heavy Industries Group, Baotou 014010, China
^4.Chongqing Changan Wangjiang Industry Group Co., Ltd., Chongqing 400020, China

引用本文:

李若浩, 胡霄雨, 王中成, 李浩, 杨勇, 徐乐, 梁恩溥, 何肖飞. 新型二次硬化钢25CrMo3NiTiVNbZr的高温力学性能和强化机理[J]. 材料研究学报, 2024, 38(5): 390-400.
Ruohao LI, Xiaoyu HU, Zhongcheng WANG, Hao LI, Yong YANG, Le XU, Enpu LIANG, Xiaofei HE. High-temperature Mechanical Properties and Strengthening Mechanism of New Secondary Hardened Steel 25CrMo3NiTiVNbZr[J]. Chinese Journal of Materials Research, 2024, 38(5): 390-400.

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摘要:

使用JMatpro和Thermo-Calc软件优化25Cr3Mo3NiNbZr钢的成分，使用透射电镜(TEM)、电子背散射衍射(EBSD)和相分析等手段表征在700℃高温拉伸前后试样的显微组织和析出相以研究其高温强化机理。结果表明：25CrMo3NiTiVNbZr钢700℃的高温抗拉强度和屈服强度分别为543 MPa、409 MPa，比25Cr3Mo3NiNbZr钢提高了139 MPa和123 MPa。根据对这种钢高温强化机理的分析，析出强化是主要强化方式。在700℃高温拉伸25CrMo3NiTiVNbZr钢其析出强化增量为367 MPa，比25Cr3Mo3NiNbZr钢提高147 MPa，其主要原因是在25CrMo3NiTiVNbZr中析出了热稳定性更高、尺寸更小(平均尺寸为7.93 nm)的析出相。

关键词 ：金属材料, 高温强度, 成分优化, 强化机理, 纳米析出相

Abstract：

A novel secondary hardened steel 25CrMo3NiTiVNbZr was developed via optimization the chemical composition of the 25Cr3Mo3NiNbZr steel bymeans of the so called JMatpro and Thermo-Calc software. Then the microstructure, phase composition, morphology of precipitates and mechanical performance at 700℃ of the 25CrMo3NiTiVNbZr steel were characterized by means of transmission electron microscopy (TEM), electron backscattering diffraction (EBSD), while its the high-temperature streng-thening mechanism was also elucidated. The results show that the tensile strength and yield strength of 25CrMo3NiTiVNbZr steel at 700^oC are 543 MPa and 409 MPa, respectively, which are 139 MPa and 123 MPa higher than that of 25Cr3Mo3NiNbZr steel. The high-temperature strengthening of the 25CrMo3NiTiVNbZr steel may mainly ascribed to themechanism, precipitation strengthening. In the process of being stretched at 700^oC, the precipitation strengthening increment derived from the precipitation of the strengthening phase for the 25CrMo3NiTiVNbZr steel reached 367 MPa, which was 147 MPa higher than that of the 25Cr3Mo3NiNbZr steel. This is mainly due to the higher thermal stability and smaller size (average size at 7.93 nm) of the precipitated strengthening phases in the 25CrMo3NiTiVNbZr steel. After high-temperature stretching, the average size of precipitates remained at 8.14 nm.

Key words： metallic materials high temperature mechanics ingredient optimization strengthening mechanism nanoprecipitated phase

收稿日期: 2023-10-19

ZTFLH:

TG142

基金资助:农机装备材料生产应用示范平台(TC200H01X/05)

通讯作者: 徐乐，正高级工程师，xule@nercast.com，研究方向为纳米析出强化高强高韧马氏体钢

Corresponding author: XU Le, Tel: 18911259273, E-mail: xule@nercast.com

作者简介: 李若浩，男，1999年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.516 或 https://www.cjmr.org/CN/Y2024/V38/I5/390

表1 实验用钢的化学成分

图1 高温拉伸试样的尺寸

图2 Ti对平衡态析出相的影响

图3 Mo对平衡态析出相的影响

图4 V对平衡态析出相的影响

图5 Cr对平衡态析出相的影响

图6 P0、P1钢的平衡相图

图7 P0、P1钢的700℃高温性能

图8 700℃高温拉伸前后析出相的形貌

图9 P0钢和P1钢700℃拉伸前后析出相尺寸的变化

表2 700℃拉伸前后试验钢中M3C相的析出量

表3 700℃拉伸前后试验钢中MC相+ M2C相的析出量

表4 700℃拉伸前后析出相的等效球状平均直径

图10 P0钢中长棒状碳化物的元素分布

图11 P1钢中长棒状碳化物的元素分布

图12 P0钢和P1钢的EBSD和原奥晶界叠加图和原奥氏体的晶粒尺寸统计

图13 试验钢的高温强化增量

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