温轧工艺对纳米贝氏体相变速率、组织和力学性能的影响

doi:10.11901/1005.3093.2014.289

材料研究学报

2015, Vol. 29

Issue (3): 207-212 DOI: 10.11901/1005.3093.2014.289

本期目录 | 过刊浏览

温轧工艺对纳米贝氏体相变速率、组织和力学性能的影响

何建国^1,²,赵爱民^1,²(

),黄耀³,智超^1,²,赵复庆^1,²

1. 北京科技大学冶金工程研究院北京 100083
2. 现代交通金属材料与加工技术北京实验室北京 100083
3. 中国电力科学研究院北京 100192

Effect of Warm Rolling Process on Phase Transformation, Microstructure and Mechanical Properties of Nano-bainite Steel

Jianguo HE^1,²,Aimin ZHAO^1,^2,^**(

),Yao HUANG³,Chao ZHI^1,²,Fuqing ZHAO^1,²

1. Metallurgical Engineering Research Institute, University of Science and Technology Beijing,
Beijing 100083, China
2. Beijing Laboratory for Modern Transportation Advanced Metal Materials and Processing Technology,
Beijing 100083, China
3. China Electric Power Research Institute, Beijing 100192, China

引用本文:

何建国,赵爱民,黄耀,智超,赵复庆. 温轧工艺对纳米贝氏体相变速率、组织和力学性能的影响[J]. 材料研究学报, 2015, 29(3): 207-212.
Jianguo HE, Aimin ZHAO, Yao HUANG, Chao ZHI, Fuqing ZHAO. Effect of Warm Rolling Process on Phase Transformation, Microstructure and Mechanical Properties of Nano-bainite Steel[J]. Chinese Journal of Materials Research, 2015, 29(3): 207-212.

全文: PDF(3588 KB) HTML

摘要:

采用温轧加等温热处理工艺制备纳米贝氏体钢, 研究了形变温度对纳米贝氏体相变速率的影响。结果表明, 形变过冷奥氏体在503 K的贝氏体等温转变时间由常规等温淬火的50 h缩短至20 h, 纳米贝氏体钢的抗拉强度为2127 MPa、延伸率为4%。在实验温度范围内进行的过冷奥氏体形变均能促进纳米贝氏体相变, 相变速率随着形变温度的降低而提高。过冷奥氏体形变量大于30%后残余奥氏体组织明显细化, 块状残余奥氏体全部转变为薄膜状。温轧工艺可在不恶化其它力学性能的前提下加速低温贝氏体相变, 从而缩短热处理时间使生产成本降低。

关键词 ：金属材料, 纳米贝氏体, 温轧, 相变动力学, 组织结构, 力学性能

Abstract：

Nanostructured bainite steel with an ultimate tensile strength of 2127 MPa, elongation of 4% has been obtained by warm rolling followed with isothermal heat treatment.The effect of deformation temperature on transformation of nano bainites has been investigated. The results show that with a proper warm defromation, the time required for the transformation of the supercooled austenite into bainite can be shortened from 50 h to 20 h. The deformation rates of supercooled austenite adopted at all temperatures in the experiments can accelerate the low temperature nanobainite transformation, while the transformation rate increased with the decreasing deformation temperature. With a deformation rate above 30%, the retained austenites were sharply refined and the blocky austenites were diminished. The low temperature nano bainite transformation can be accelerated by warm rolling process without harm to the strength, thus shortening the time of heat treatment resulting in cost saving of the steel production.

Key words： metallic materials nanobainite warm rolling transformation kinetic microstructure mechanical properties

收稿日期: 2014-06-17

基金资助:* 国家自然科学基金51271035和51371032资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.289 或 https://www.cjmr.org/CN/Y2015/V29/I3/207

图1 原位热模拟实验工艺示意图

图2 温轧工艺示意图

图3 纳米贝氏体等温相变动力学曲线

图4 在不同温度20%变形量对纳米贝氏体相变动力学的影响

图5 在不同温度变形量为20%纳米贝氏体转变速率与时间的关系

图6 在503 K不同压下量温轧后等温的纳米贝氏体组织SEM像

图7 温轧总压下量为33%和50%的纳米贝氏体显微结构TEM像

表1 等温淬火和温轧纳米贝氏体钢的力学性能

图8 不同工艺组织中残余奥氏体的含量及含碳量

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