金属热处理 ›› 2020, Vol. 45 ›› Issue (6): 93-97.DOI: 10.13251/j.issn.0254-6051.2020.06.021

• 组织与性能 • 上一篇    下一篇

OD1422 mm的X80级管线钢SH-CCT曲线测定与分析

于晨阳1, 池强2, 张伟卫2, 胡美娟2, 陈庆龙1, 葛加林1   

  1. 1. 西安石油大学 材料科学与工程学院, 陕西 西安 710065;
    2. 中国石油集团石油管工程技术研究院, 陕西 西安 710065
  • 收稿日期:2019-12-23 出版日期:2020-06-25 发布日期:2020-09-02
  • 通讯作者: 张伟卫,高级工程师,硕士,E-mail:zhangweiwei008@cnpc.com.cn
  • 作者简介:于晨阳(1994—),女,硕士研究生,主要研究方向为石油管的使役性能及安全性,E-mail:2517917293@qq.com。
  • 基金资助:
    国家重点研发计划(2017YFB0304900);西安石油大学研究生创新与实践能力培养计划(YCS18212046)

Determination and analysis of SH-CCT curve of X80 pipeline steel with OD1422 mm

Yu Chenyang1, Chi Qiang2, Zhang Weiwei2, Hu Meijuan2, Chen Qinglong1, Ge Jialin1   

  1. 1. School of Material Science and Engineering, Xi'an Shiyou University, Xi'an Shaanxi 710065, China;
    2. Tubular Goods Research Center of CNPC, Xi'an Shaanxi 710065, China
  • Received:2019-12-23 Online:2020-06-25 Published:2020-09-02

摘要: 采用Gleeble3500热-力学模拟试验机,对外径为φ1422 mm的X80管线钢焊接热影响区(HAZ)在不同冷却速度下的热循环过程进行了模拟,利用热膨胀法绘制模拟焊接热影响区连续冷却组织转变曲线(SH-CCT);结合光学显微组织和硬度测试等分析手段,研究了φ1422 mm的X80管线钢在不同冷却速度条件下焊接热影响区的组织变化规律。结果表明,冷却速度对X80管线钢的相变行为和微观结构具有显著影响。当冷却速度为1 ℃/s时,组织转变为贝氏体;当冷却速度达到7 ℃/s时,开始产生马氏体组织;当冷却速度为20 ℃/s时,组织内较高位错密度的板条贝氏体较多,组织晶粒较小。当冷却速度在7~20 ℃/s之间时,X80管线钢热影响区的显微硬度和冲击性能都大于母材。

关键词: X80管线钢, SH-CCT曲线, 热影响区, 显微硬度, 冲击性能

Abstract: The Gleeble3500 thermo-mechanical simulation tester was used to simulate the thermal cycling process of the X80 pipeline steel with OD1422 mm at different cooling rates. The thermal expansion method was used to simulate the continuous cooling transformation curve of simulated heat affected zone (SH-CCT). Combined with microstructure analysis and hardness test, the microstructure change of welding heat affected zone (HAZ) of the X80 pipeline steel at different cooling rate conditions was studied. The test results show that the cooling rate has a significant effect on the phase transformation behavior of the steel. When the cooling rate is 1 ℃/s, the microstructure is transformed into bainite. When the cooling rate is 7 ℃/s, the martensitic transformation begins. When the cooling rate is 20 ℃/s, more lath bainite with higher dislocation density is obtained and the grain size is smaller. When the cooling rate is between 7 ℃/s and 20 ℃/s, the microhardness and impact property are greater than the base metal.

Key words: X80 pipeline steel, SH-CCT curve, heat affected zone(HAZ), microhardness, impact property

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