钒及热处理工艺对贝氏体钢中奥氏体碳富集的影响

doi:10.13251/j.issn.0254-6051.2020.01.003

金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 11-15.DOI: 10.13251/j.issn.0254-6051.2020.01.003

钒及热处理工艺对贝氏体钢中奥氏体碳富集的影响

樊朋煜, 刘蓉, 高古辉, 桂晓露, 白秉哲

北京交通大学机械与电子控制工程学院, 北京 100089

收稿日期:2019-09-28 出版日期:2020-01-25 发布日期:2020-04-03
通讯作者: 高古辉,副研究员,主要从事贝氏体钢研究,E-mail:gaogh@bjtu.edu.cn
作者简介:樊朋煜(1995—),男,硕士研究生,主要从事金属材料热处理研究,E-mail:17121351@bjtu.edu.cn。
基金资助:
北京市自然基金“面上”项目(2172047);国家重点研发计划(2017YFB0304501)

Effect of V and heat treatment on carbon enrichment in austenite of bainitic steel

Fan Pengyu, Liu Rong, Gao Guhui, Gui Xiaolu, Bai Bingzhe

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100089, China

Received:2019-09-28 Online:2020-01-25 Published:2020-04-03

摘要/Abstract

摘要： 研究了V以及BAT工艺、BQ&P工艺、DBAT工艺对中高碳(~0.6wt% C)纳米贝氏体钢等温转变过程中奥氏体碳富集的影响。为了分析不同热处理工艺时的组织转变,采用DIL805L型膨胀仪、X射线衍射仪(XRD)测量并计算残留奥氏体含量及其中碳含量,利用扫描电镜(SEM)分析了等温转变过程中试验钢显微组织形貌,并统计M/A岛含量及尺寸。结果表明:V对贝氏体转变有抑制作用,使残留奥氏体中碳富集速率变慢;3种热处理工艺下碳富集速率不同,BQ&P工艺和DBAT工艺的碳富集速率均大于BAT工艺,可利用BQ&P、DBAT工艺弥补合金元素V推迟相变的影响。

关键词: V微合金化, 碳富集, 残留奥氏体, 贝氏体钢

Abstract: Effect of V and three different heat treatments, namely, BAT, BQ&P and DBAT processes, on carbon enrichment in austenite during isothermal transformation of high carbon (about 0.6wt%C) nano-structured bainitic steel was studied. In order to capture the microstructure evolution during each route, dilatometric measurements were carried out on a DIL805L high-resolution dilatometer. X-ray diffractometer (XRD) was used to measure and calculate the retained austenite content and its carbon content.Scanning electron microscope (SEM) was used to analyze the microstructure morphology of the experimental steel during isothermal transformation, and the content and size of M/A islands were calculated. The results show that V microalloyingc an inhibit the bainite transformation and slow down the carbon enrichment rate in the residual austenite. The carbon enrichment rates of BQ&P process and DBAT process are different under the three heat treatment processes. The carbon enrichment rates of both BQ&P and DBAT processes are higher than that of BAT process. Hence, BQ&P and DBAT processes can be used to offset the retard influence of V microalloying on bainitic transformation.

Key words: vanadium microalloying, carbon enrichment, retained austenite, bainitic steel

中图分类号:

TG156.1

樊朋煜, 刘蓉, 高古辉, 桂晓露, 白秉哲. 钒及热处理工艺对贝氏体钢中奥氏体碳富集的影响[J]. 金属热处理, 2020, 45(1): 11-15.

Fan Pengyu, Liu Rong, Gao Guhui, Gui Xiaolu, Bai Bingzhe. Effect of V and heat treatment on carbon enrichment in austenite of bainitic steel[J]. HTM, 2020, 45(1): 11-15.

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钒及热处理工艺对贝氏体钢中奥氏体碳富集的影响

Effect of V and heat treatment on carbon enrichment in austenite of bainitic steel

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