[1]段 贺,单以银,杨 柯,等.Nb和Mo含量对高钢级管线钢相变行为及组织和性能的影响[J].焊管,2021,44(9):7-13.[doi:10.19291/j.cnki.1001-3938.2021.09.002]
　DUAN He,SHAN Yiyin,YANG Ke,et al.Effect of Nb and Mo Content on Phase Transformation Behavior and Microstructure of High Grade Pipeline Steel[J].,2021,44(9):7-13.[doi:10.19291/j.cnki.1001-3938.2021.09.002]
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Nb和Mo含量对高钢级管线钢相变行为及组织和性能的影响()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
第44卷
期数:
2021年第9期
页码:
7-13
栏目:
试验与研究
出版日期:
2021-09-28

文章信息/Info

Title:
Effect of Nb and Mo Content on Phase Transformation Behavior and Microstructure of High Grade Pipeline Steel
文章编号:
10.19291/j.cnki.1001-3938.2021.09.002
作者:
段 贺; 单以银; 杨 柯; 史显波; 严 伟; 任 毅
1. 中国科学院金属研究所，沈阳 110016；2. 中国科学技术大学 材料科学与工程学院，沈阳 110167；3. 海洋装备用金属材料及其应用国家重点实验室，辽宁 鞍山 114009
Author(s):
DUAN He;  SHAN Yiyin;  YANG Ke;  SHI Xianbo;  YAN Wei;  REN Yi
1. Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China; 2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110167, China; 3. State Key Laboratory of Metal Materials and Application for Marine Equipment, Anshan 114009, Liaoning, China
关键词:
管线钢; Nb; Mo; 动态CCT曲线; 大角度晶界
Keywords:
pipeline steel;  Nb;  Mo;  dynamic CCT curve;  high angle grain boundary
分类号:
TG142.1
DOI:
10.19291/j.cnki.1001-3938.2021.09.002
文献标志码:
A
摘要:
为合理设计高强管线钢的化学成分，采用热模拟试验研究了Nb、Mo含量对管线钢热变形奥氏体连续冷却转变曲线及组织的影响，并对比研究了两种管线钢经相同热机械控制轧制（TMCP）后的组织和性能。结果显示，随着Nb和Mo含量的减少，针状铁素体的转变温度升高，获得针状铁素体组织的临界冷却速度增大，使热变形过冷奥氏体的CCT曲线向左上方移动，同时晶粒尺寸也发生明显粗化；在相同的轧制工艺条件下，降低钢中Nb和Mo的含量，钢的强度和低温冲击韧性下降。研究表明，沉淀强化作用的减弱以及有效晶粒尺寸的增大共同导致管线钢强度的降低，大角度晶界比例的大幅度降低导致了低温冲击吸收功的降低。
Abstract:
In order to reasonably design the chemical composition of high strength pipeline steel, the effects of Nb and Mo content on the continuous cooling transformation curve and microstructure of pipeline hot deformed austenite were studied by thermal simulation test machine, and the microstructure and properties of two pipeline steels after the same thermo mechanical control process (TMCP) were compared. The results show that with the decrease of Nb and Mo content, the transformation temperature of acicular ferrite increases, the critical cooling rate of acicular ferrite increases, the CCT curve of hot deformed overcooled austenite moves to the upper left, and the grain size also coarsens obviously. Under the same rolling process conditions, the strength and low temperature impact toughness of the steel decrease with the reduction of the content of Nb and Mo in the steel. The weakness of precipitation strengthening and the increase of effective grain size jointly affect the reduction of strength. The large reduction of the proportion of large angle grain boundaries leads to the reduction of low-temperature impact absorption energy.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期：2021-07-14基金项目： 国家重点研发项目“高钢级管线钢低温强韧化控制的冶金学原理及关键技术”（项目编号2017YFB0304901）。作者简介：段 贺（1994—），女，博士研究生，主要从事微合金钢低温韧性研究。
更新日期/Last Update: 2021-09-16