• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (10): 43-51.doi: 10.3901/JME.2017.10.043

• 短流程轧制技术专栏 • 上一篇    下一篇

AZ31B镁合金板材多道次轧制路径研究

徐海洁1, 马立峰1, 刘崇林2, 刘光明1, 黄志权1, 刘鹏涛1, 林金宝1   

  1. 1. 太原科技大学重型机械教育部工程研究中心 太原 030024;
    2. 广西柳州钢铁集团有限公司转炉炼钢厂 柳州 545002
  • 出版日期:2017-05-15 发布日期:2017-05-15
  • 作者简介:

    徐海洁,女,1990年出生。主要研究方向为轧制工艺与塑性变形理论。

    E-mail:xuhaijie0113@163.com

    刘崇林(通信作者),男,1983年出生,博士,主任工程师。主要研究方向为连铸过程工艺优化、品种钢的开发、连铸坯质量的控制。

    E-mail:liuchonglin2003@163.com

  • 基金资助:
    * NSFC-山西煤基低碳联合重点基金(U161020023)、山西省重点研发计划(201603D111004,201603D121010)、山西省“青年三晋学者”特聘教授支持计划、江苏省“双创团队”领军人才和晋城市科技计划(201501004-10)资助项目; 20160725收到初稿,20170302收到修改稿;

Research of Multi-pass Rolling Routes for AZ31B Magnesium Alloy Sheet

XU Haijie1, MA Lifeng1, LIU Chonglin2, LIU Guangming1, HUANG Zhiquan1, LIU Pengtao1, LIN Jinbao1   

  1. 1. Heavy Machinery Engineering Research Center of the Ministry Education,Taiyuan University of Science and Technology, Taiyuan 030024;
    2. Steel Plant, Guangxi liuzhou Iron and Steel Group Company Limited, Liuzhou 545002
  • Online:2017-05-15 Published:2017-05-15

摘要:

在250~400 ℃初轧温度条件下,对铸轧态AZ31B镁合金板材进行四道次不同轧制路径的轧制试验,采用Axio Imager A2m金相显微镜对微观组织进行观察,采用WDW-E100D电子万能试验机对试样室温拉伸性能进行检测。综合研究不同初轧温度及轧制路径对轧后镁板的宏观成形性、微观组织和力学性能的影响。研究结果表明:轧后镁板组织性能与轧制工艺存在较强相关性。随初轧温度的升高,镁板屈服强度和抗拉强度均逐渐减小,伸长率逐渐增大;不同路径的交叉轧制对镁板边裂现象有较好的改善作用,初轧温度升至400 ℃后边裂消失;轧后镁板RD-ND截面与TD-ND截面微观组织分布一致,晶粒尺寸均为单峰正态分布特点,不同路径交叉轧制均能有效提高晶粒尺寸分布的均匀性,改善轧后镁板的各向异性,多道次交叉轧制对镁板晶粒细化及均匀化作用最明显。

关键词: 轧制路径, 组织性能, AZ31B镁合金

Abstract:

Under the initial rolling temperatures of 250 to 400 ℃, AZ31B magnesium alloy sheets are rolled by four different rolling routes. Microstructures of the rolled sheets are observed by Axio Imager A2m Metallographic Microscope, and room-temperature tensile properties are detected by WDW-E100D Electronic Universal Testing Machine. Then the formabilities, microstructures and mechanical properties of the rolled sheets are analyzed by comprehensively considering different initial rolling temperatures and rolling routes. The results of the research indicate that: obvious correlation is revealed between rolling process and microstructures and mechanical properties of the rolled magnesium alloy sheets. Along with the rising of initial rolling temperature, yield strength and tensile strength of rolled sheets are gradually decreased, and elongation is increased; edge cracks have been greatly reduced by different routes of cross-rolling, and edge crack disappears at the initial rolling temperature of 400 ℃; the distributions of microstructures of RD-ND section and TD-ND section are similar, and unimodal normal distribution of the grain size is presented; The uniformity of the grain size distribution can be effectively improved and anisortropy can be weakened by different routes of cross-rolling; uniform, fine and equiaxial grain microstructures can be produced by multi-pass cross rolling process.

Key words: microstructure and mechanical property, rolling route, AZ31B magnesium alloy