Nb-Mo微合金化对δ-TRIP钢组织和力学性能的影响

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英文篇名：Effect of Nb-Mo microalloying on microstructure and mechanical properties of δ-TRIP steel 作者：洪济舟 ; 宋双喜 ; 王俊峰 ; 王利 ; 王晓东 英文作者：Hong Jizhou;Song Shuangxi;Wang Junfeng;Wang Li;Wang Xiaodong;School of Materials Science and Engineering,Shanghai Jiao Tong University;Research Institute,Baoshan Iron and Steel Co.,Ltd.;State Key Laboratory of Development and Applicaton Technology of Automotive Steels (Baosteel); 关键词：δ-TRIP钢 ; 微合金化 ; 性能 ; 组织 ; 纳米析出相 英文关键词：δ-TRIP steel;;microalloying;;mechanical properties;;microstructure;;nano-precipitates 中文刊名：JSRC 英文刊名：Heat Treatment of Metals 机构：上海交通大学材料科学与工程学院;宝山钢铁股份有限公司研究院;汽车用钢开发与应用技术国家重点实验室(宝钢); 出版日期：2019-05-25 出版单位：金属热处理 年：2019 期：v.44;No.501 基金：上海市自然科学基金(17ZR1415000);; 国家重点研发计划重点专项(2017YFB0703000) 语种：中文; 页：JSRC201905002 页数：6 CN：05 ISSN：11-1860/TG 分类号：8-13

摘要

采用SEM、TEM、EBSD等分析了Nb-Mo微合金化对δ-TRIP钢力学性能、组织结构的影响。结果表明:Nb-Mo微合金化试验钢及对照钢均为复相组织,主要由δ铁素体、贝氏体、α铁素体和残留奥氏体等构成。添加微量Nb-Mo元素后,试验钢组织中残留奥氏体含量略有增加,同时伴随着大量纳米级Nb-Mo碳化物析出;并且试验钢的力学性能明显改善,其抗拉强度达到1044 MPa,伸长率为22. 4%。微观组织表征结果表明:其主要强化机制为残留奥氏体的相变诱发塑性(TRIP)效应以及纳米尺寸Nb、Mo碳化物通过钉扎晶界和位错,从而达到细晶强化和第二相颗粒强化。
        The influence of Nb-Mo microalloying on the mechanical property and microstructure of δ-TRIP steel was analyzed by scanning electron microscope( SEM),transmission electron microscope( TEM),electron back-scattered diffraction( EBSD).The result indicates that the microstructure of both the steels with and without Nb-Mo microalloying contain delta-ferrite,bainite,alpha-ferrite and retained austenite phases.After adding trace Nb-Mo,the volume fraction of retained austenite slightly increases and a mass of nano-size Nb-Mo carbides precipitate out.Further,the mechanical properties of the Nb-Mo steel are signally promoted with the tensile strength of 1044 MPa and the elongation of 22.4%.The microstructure characterization shows that the major strengthening mechanisms of the Nb-Mo microalloying steel are the transformation-induced plasticity( TRIP) effect of retained austenite,as well as the fine-grain strengthening and second-phase strengthening caused by Nb-Mo carbide pinning grain boundaries or dislocations.

引文

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