轧制工艺对钢板组织形貌及内应力的影响

高朋, 卓越, 郭艳艳, 孙国栋, 孙建亮

doi:10.16577/j.issn.1001-1560.2022.0332

材料保护 >

2022 , Vol. 55 >Issue 12: 7 - 13

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0332

冷轧板表面防护的发展专栏

轧制工艺对钢板组织形貌及内应力的影响

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¹九江学院机械与智能制造学院； ²九江学院图书馆； ³九江学院材料科学与工程学院； ⁴燕山大学国家冷轧板带装备及工艺工程技术研究中心

高朋(1978-)，副教授，博士，主要从事钢板控轧控冷、镀锡及镀镍工艺与组织性能研究，电话:17897927979，E-mail:15781807＠qq.com

收稿日期: 2022-06-18

修回日期: 2022-07-19

录用日期: 2022-08-17

网络出版日期: 2023-12-26

基金资助

国家重点研发计划资助项目(2017YFB0306404)；江西省教育厅科技项目(GJJ211821)资助

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Effect of Rolling Process on Microstructure Morphology and Internal Stress of Steel Plate

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(1a. School of Mechanical and Intelligent Manufacturing， 1b. Library， 1c. School of Materials Science and Engineering，Jiujiang University， Jiujiang 332005，China； 2. National Engineering Research Center for Equipment and Technology of Cold Rolling Strip， Yanshan University， Qinhuangdao 066004， China)

Received date: 2022-06-18

Revised date: 2022-07-19

Accepted date: 2022-08-17

Online published: 2023-12-26

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摘要

为了研究不同轧制工艺对管线钢组织形貌及内应力的影响，通过轧制工艺实验、热力耦合数值仿真2种方法研究不同工艺下钢板的温度场及应力场，利用金相显微镜、XRD 分析测试钢板的显微组织形貌和内应力。通过对钢板表面温度进行实测，结果表明:模拟值与实测值误差较小，数值仿真计算的温度场合理，可作为应力场分析依据。钢板经过20 s 水冷后，钢板芯部与角部最大温差318 ℃，最小温差211 ℃；钢板芯部与角部最大应力差417 MPa，最小应力差260 MPa，获得的钢板显微组织由贝氏体、马氏体、铁素体组成。根据实验和数值分析结果得出，终轧温度控制在800～900 ℃，冷却速率控制在20～25 ℃/s 区间比较合理。在此工艺参数下钢板的相变形核率高，内应力差值较小，并最终形成了马氏体、贝氏体、铁素体的混合组织。

关键词： 热力耦合; 轧制工艺; 管线钢; 显微组织; 内应力

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高朋, 卓越, 郭艳艳, 孙国栋, 孙建亮 . 轧制工艺对钢板组织形貌及内应力的影响[J]. 材料保护, 2022 , 55(12) : 7 -13 . DOI: 10.16577/j.issn.1001-1560.2022.0332

Abstract

For studying the influence of different rolling processes on the microstructure morphology and internal stress of pipeline steel， the temperature field and stress field of steel plate under different processes were studied by rolling process experiment and thermal mechanical coupling numerical simulation. Subsequently， the microstructure morphology and internal stress of steel plate were tested and analyzed by metallographic microscope and XRD. The results of an actual measurement of the surface temperature of steel plate showed that the error between the simulated value and the measured value was small， and the temperature field calculated by numerical simulation was reasonable，which could be the basis for stress field analysis. After the steel plate was water-cooled for 20 s，the maximum and minimum temperature differences between the steel plate core and corner were 318 ℃and 211 ℃respectively. The maximum and minimum stress difference between the core and corner of the steel plate was 417 MPa and 260 MPa respectively. In addition， the obtained microstructure was composed of bainite，martensite and ferrite. It could be concluded from the results of experiments and numerical analysis that， it was reasonable to control the final rolling temperature at 800～900 ℃and the cooling rate at 20 ～25 ℃/s. Under these process parameters， the phase transformation nucleation rate of the steel plate was high， the internal stress difference was small， and a mixed microstructure comprising of martensite， bainite and ferrite was finally formed.

Key words： thermal mechanical coupling; rolling process; pipeline steel; microstructure; internal stress

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