退火工艺对一种超级铁素体不锈钢管材TCP相析出的影响

doi:10.13385/j.cnki.vacuum.2025.03.03

真空 ›› 2025, Vol. 62 ›› Issue (3): 15-20.doi: 10.13385/j.cnki.vacuum.2025.03.03

退火工艺对一种超级铁素体不锈钢管材TCP相析出的影响

孟涛¹, 郑世豪², 刘恩泽³, 谭政³, 宁礼奎³

1.海军装备部,陕西西安 710021;
2.中国石油化工股份有限公司洛阳分公司,河南洛阳 471000;
3.中国科学院金属研究所,辽宁沈阳 110016

收稿日期:2024-12-03 出版日期:2025-05-25 发布日期:2025-05-23
通讯作者: 宁礼奎,副研究员。
作者简介:孟涛（1981-）,男,辽宁省沈阳市人,本科,工程师。

Effect of Annealing Treatment on TCP Phase Precipitation in a Super Ferritic Stainless Steel Tube

MENG Tao¹, ZHENG Shihao², LIU Enze³, TAN Zheng³, NING Likui³

1. Navy Equipment Department, Xi'an 710021, China;
2. China Petroleum and Chemical Corporation Luoyang Branch, Luoyang 471000, China;
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2024-12-03 Online:2025-05-25 Published:2025-05-23

摘要/Abstract

摘要： 以冷轧态29Cr-4Mo-TiNb超级铁素体不锈钢冷轧管材为对象,通过光学显微镜（OM）、扫描电镜（SEM）及能谱分析（EDS）等方法,系统研究了退火工艺对该钢种冷轧管材微观组织中TCP相析出规律的影响。结果表明,29Cr-4Mo-TiNb钢中夹杂物主要为复合型Al₂O₃·TiN·Nb（C,N）;在850~950 ℃温度区间,保温2 min后管材中便有Laves相析出,先析出的Laves相促进了后析出σ相的形成,σ相析出量随保温时间延长而增加,随退火温度升高而降低;当退火温度升高至1000 ℃,在保温30 min过程中,未发现有Laves相和σ相析出。

关键词: 29Cr-4Mo-TiNb钢, 超级铁素体不锈钢, 真空感应熔炼, Laves相, σ相

Abstract: The effect of annealing process on the TCP phase precipitation in the microstructure of cold-rolled 29Cr-4Mo-TiNb super ferritic stainless steel pipe was studied by optical microscope (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results indicate that the inclusions in 29Cr-4Mo-TiNb steel predominantly consist of composite Al₂O₃·TiN·Nb(C,N). Within the temperature range of 850-950 ℃, Laves phases begin to precipitate after just 2 minutes of holding time, the initial precipitation of Laves phases promotes the subsequent formation of σ phases. The amount of σ phase precipitated increases with longer holding times but decreases with higher annealing temperatures. When the annealing temperature is raised to 1 000 ℃, no Laves or σ phases are observed throughout the entire 30-minute holding period.

Key words: 29Cr-4Mo-TiNb steel, super ferritic stainless steel, vacuum induction melting, Laves phase, σphase

中图分类号: TG142.71

孟涛, 郑世豪, 刘恩泽, 谭政, 宁礼奎. 退火工艺对一种超级铁素体不锈钢管材TCP相析出的影响[J]. 真空, 2025, 62(3): 15-20.

MENG Tao, ZHENG Shihao, LIU Enze, TAN Zheng, NING Likui. Effect of Annealing Treatment on TCP Phase Precipitation in a Super Ferritic Stainless Steel Tube[J]. VACUUM, 2025, 62(3): 15-20.

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退火工艺对一种超级铁素体不锈钢管材TCP相析出的影响

Effect of Annealing Treatment on TCP Phase Precipitation in a Super Ferritic Stainless Steel Tube

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