基于TMCP的P92钢管的在线形变热处理

doi:10.13251/j.issn.0254-6051.2025.09.020

金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 132-139.DOI: 10.13251/j.issn.0254-6051.2025.09.020

基于TMCP的P92钢管的在线形变热处理

黄亮¹, 马辉², 王晓东¹, 包喜荣¹

1.内蒙古科技大学材料与冶金学院, 内蒙古包头 014010;
2.金属成形技术与重型全国重点实验室, 陕西西安 710018

收稿日期:2025-03-09 修回日期:2025-06-18 出版日期:2025-09-25 发布日期:2025-10-13
通讯作者: 王晓东,副教授,博士,E-mail: wxd6595111@126.com
作者简介:黄亮(1999—),男,硕士,主要研究方向为无缝钢管的组织与性能,E-mail: 1147346704@qq.com。
基金资助:
国家自然科学基金(52164046);内蒙古自治区自然科学基金(2024LHMS05014);金属成形技术与重型装备全国重点实验室开放课题(S2208100.W05);内蒙古科技大学基本科研业务费专项资金(2023QNJS031,2023QNJS032)

Online thermomechanical treatment of P92 steel pipes based on TMCP

Huang Liang¹, Ma Hui², Wang Xiaodong¹, Bao Xirong¹

1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. National Key Laboratory of Metal Forming Technology and Heavy-duty Equipment, Xi'an Shaanxi 710018, China

Received:2025-03-09 Revised:2025-06-18 Online:2025-09-25 Published:2025-10-13

摘要/Abstract

摘要： 利用 Gleeble-3500 热模拟机系统研究了P92钢的动态再结晶行为、动态相变行为,并进行了在线形变热处理工艺探索。基于动态再结晶行为,确定P92钢的最佳热挤压工艺参数为:挤压温度1050 ℃、应变速率0.5 s^-1。基于动态相变行为,选择1050 ℃、0.5 s^-1,在1 ℃/s冷却速度下,随着热变形量的增加(30%、40%、50%),马氏体转变点Ms上升,说明形变促进马氏体相变。变形量为40%时,在0.5~3 ℃/s冷却速度下能得到细小的板条马氏体,有助于优化P92钢的组织与性能。基于上述试验结果,选择挤压终止温度1050 ℃、应变速率0.5 s^-1、变形量 50%,发现随着冷速的增加(0.5、1、2 ℃/s),通过TMCP在线热处理生产的P92钢马氏体板条和Nb碳化物尺寸明显细化,2 ℃/s冷却时组织性能最佳,马氏体板条细化至0.3 μm,Nb碳化物析出相细化至73.3 nm,硬度提升至60.2 HRC。因此,对于P92钢管,应在1050 ℃热挤压后采用2 ℃/s的冷却速度进行在线形变热处理。

关键词: P92钢, 动态再结晶, 动态相变, 在线形变热处理, 热机械控制加工(TMCP)

Abstract: Dynamic recrystallization behavior and dynamic phase transformation behavior of P92 steel were investigated by using Gleeble-3500 thermal simulation machine system, and online thermomechanical treatment processes were explored. The results based on the dynamic recrystallization behavior show that the optimal hot extrusion process parameters for the P92 steel are the extrusion temperature of 1050 ℃ and strain rate of 0.5 s^-1. Based on the dynamic phase transformation behavior at 1050 ℃ and 0.5 s^-1, under the same cooling rate of 1 ℃/s after deformation, the martensite transformation point Ms rises with the increase of the amount of hot deformation increases(30%, 40%, 50%), indicating that deformation promotes martensite phase transformation. When the deformation is 40%, the cooling rate after deformation is between 0.5-3 ℃/s, fine plate-like martensite can be obtained, which helps optimize the microstructure and properties of the P92 steel. Based on the above experimental results, with an extrusion termination temperature of 1050 ℃, strain rate of 0.5 s^-1 and deformation of 50%, it is found that as the cooling rate increases(0.5, 1, 2 ℃/s), the lath martensite and Nb carbides produced through TMCP online heat treatment are significantly refined. At a cooling rate of 2 ℃/s, the microstructure and properties are optimal, the lath martensite are refined to 0.3 μm, Nb carbide precipitates are refined to 73.3 nm, and hardness is increased to 60.2 HRC. Therefore, for the P92 steel tubes, online thermomechanical treatment processes with a cooling rate of 2 ℃/s are recommended after hot extrusion at 1050 ℃.

Key words: P92 steel, dynamic recrystallization, dynamic phase transformation, online thermomechanical treatment, thermo-mechanical control process(TMCP)

中图分类号:

TG111

黄亮, 马辉, 王晓东, 包喜荣. 基于TMCP的P92钢管的在线形变热处理[J]. 金属热处理, 2025, 50(9): 132-139.

Huang Liang, Ma Hui, Wang Xiaodong, Bao Xirong. Online thermomechanical treatment of P92 steel pipes based on TMCP[J]. Heat Treatment of Metals, 2025, 50(9): 132-139.

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基于TMCP的P92钢管的在线形变热处理

Online thermomechanical treatment of P92 steel pipes based on TMCP

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