贝氏体含量对F/B双相管线钢力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.01.034

金属热处理 ›› 2021, Vol. 46 ›› Issue (1): 187-192.DOI: 10.13251/j.issn.0254-6051.2021.01.034

贝氏体含量对F/B双相管线钢力学性能的影响

史显波¹, 殷培华¹, 严伟¹, 单以银¹, 任毅²

1.中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳 110016;
2.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

收稿日期:2020-06-18 出版日期:2021-01-25 发布日期:2021-01-26
作者简介:史显波(1988—),男,博士,主要研究方向为管线钢的组织和性能,E-mail:xbshi@imr.ac.cn
基金资助:
国家重点研发计划(2017YFB0304901,2018YFC0310304);海洋装备用金属材料及其应用国家重点实验室开放基金(SKLMEA-K201901)

Effect of bainite content on mechanical properties of ferrite/bainite(F/B) dual phase pipeline steel

Shi Xianbo¹, Yin Peihua¹, Yan Wei¹, Shan Yiyin¹, Ren Yi²

1. Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016,China;
2. State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan Liaoning 114009,China

Received:2020-06-18 Online:2021-01-25 Published:2021-01-26

摘要/Abstract

摘要： 采用700、720、740、760 ℃临界区热处理的方法,依次获得了4种不同贝氏体体积分数(16%、28%、41%、48%)的铁素体/贝氏体(F/B)双相管线钢。利用SEM、TEM及力学性能测试手段,研究了贝氏体含量对管线钢的强度、塑性和韧性的综合影响规律。结果表明,相比原始组织,F/B双相管线钢具有较低的屈服强度和相当的抗拉强度,从而具有较好的应变能力,表现为较低的屈强比,较高的伸长率和加工硬化指数。贝氏体含量对F/B组织管线钢的强度、伸长率和加工硬化指数影响较小,对冲击性能的影响显著。贝氏体含量在40%左右时可获得最佳的强度、塑性和韧性。

关键词: 管线钢, 铁素体/贝氏体, 贝氏体含量, 显微组织, 力学性能

Abstract: A ferrite/bainite (F/B) dual-phase pipeline steel was heat treated at 700,720,740,and 760 ℃ in the dual-phase region and steel specimens with 4 different volume fractions (16%,28%,41%,48%)of bainite were obtained.The effect of volume fraction of bainite on the strength,plasticity and toughness of the steel was studied by using SEM,TEM and mechanical properties test.The results show that the F/B dual-phase microstructure has lower yield strength and comparable tensile strength,resulting in better strain capacity,namely,lower yield ratio,higher elongation and work hardening exponent compared with that of as-rolled original microstructure.The volume fraction of bainite has little effect on the strength,elongation and work hardening exponent for the F/B dual-phase pipeline steel,however,it plays an significant role in impact property.The excellent strength,plasticity and toughness can be obtained when the volume fraction of bainite is around 40%.

Key words: pipeline steel, ferrite/bainite, volume fraction of bainite, microstructure, mechanical properties

中图分类号:

TG142.31

史显波, 殷培华, 严伟, 单以银, 任毅. 贝氏体含量对F/B双相管线钢力学性能的影响[J]. 金属热处理, 2021, 46(1): 187-192.

Shi Xianbo, Yin Peihua, Yan Wei, Shan Yiyin, Ren Yi. Effect of bainite content on mechanical properties of ferrite/bainite(F/B) dual phase pipeline steel[J]. Heat Treatment of Metals, 2021, 46(1): 187-192.

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贝氏体含量对F/B双相管线钢力学性能的影响

Effect of bainite content on mechanical properties of ferrite/bainite(F/B) dual phase pipeline steel

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