0.23C-1.9Mn-1.6Si钢中的残余奥氏体对韧塑性的影响<sup>*</sup>

doi:10.11901/1005.3093.2013.623

材料研究学报

2014, Vol. 28

Issue (4): 274-280 DOI: 10.11901/1005.3093.2013.623

本期目录 | 过刊浏览

0.23C-1.9Mn-1.6Si钢中的残余奥氏体对韧塑性的影响^*

任勇强,尚成嘉(

),张宏伟,袁胜福,陈二虎

北京科技大学材料科学与工程学院北京 100083

Effect of Retained Austenite on Toughness and Plasticity of 0.23C-1.9Mn-1.6Si Steel

Yongqiang REN,Chengjia SHANG(

),Hongwei ZHANG,Shengfu YUAN,Erhu CHEN

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

引用本文:

任勇强,尚成嘉,张宏伟,袁胜福,陈二虎. 0.23C-1.9Mn-1.6Si钢中的残余奥氏体对韧塑性的影响^*[J]. 材料研究学报, 2014, 28(4): 274-280.
Yongqiang REN, Chengjia SHANG, Hongwei ZHANG, Shengfu YUAN, Erhu CHEN. Effect of Retained Austenite on Toughness and Plasticity of 0.23C-1.9Mn-1.6Si Steel[J]. Chinese Journal of Materials Research, 2014, 28(4): 274-280.

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摘要:

采用优化的IQ&P工艺处理成分为0.23C-1.9Mn-1.6Si厚度为6.5 mm的低碳硅锰钢, 制备出由亚温铁素体、马氏体以及残余奥氏体构成、抗拉强度为1000 MPa的多相组织高强钢。用SEM、XRD、拉伸以及示波冲击等手段对其显微组织和力学性能进行表征, 并与同等抗拉强度的IQ&T钢和Q&T钢对比, 研究了钢中残余奥氏体对韧塑性的影响。结果表明, 在室温下IQ&P多相钢具有更高的冲击韧性、更好的延伸性能和强塑积, 综合韧塑性要远优于其它钢种。该钢的性能, 与其多相组织结构有密切的关系。大量弥散分布于铁素体和马氏体框架内的残余奥氏体在形变过程中发生TRIP效应, 显著改善了钢的韧塑性, 从而使其综合力学性能提高。

关键词 ：金属材料, 多相组织, 残余奥氏体, 冲击韧性, 均匀延伸率, 强塑积

Abstract：

The 6.5 mm thick plate of a multiphase steel (0.23C-1.9Mn-1.6Si%) composed of intercritical ferrite, martensite and well-distributed retained austenite was obtained by an optimized IQ&P process. Tensile strength of this kind of multiphase steel is higher than 1000MPa. Microstructure of the steel was characterized by means of SEM and XRD, and its mechanical properties were measured by the tensile and instrumented Charpy impact testing at room temperature. In comparison with the IQ&T steel and Q&T steel, which have the same tensile strength, the IQ&P steel shows much better comprehensive mechanical properties with higher toughness, better elongation and bigger products of tensile strength and total elongation. The reason for this is mainly the multi-phase microstructure of the IQ&P steel. TRIP effect of the retained austenite which occurs during the deformation process can significantly improve the toughness and plasticity of the IQ&P steel, and thus contributed to the improvement of mechanical properties.

Key words： metallic materials multiphase microstructure retained austenite impact toughness uniform elongation products of tensile strength and total elongation

收稿日期: 2013-08-29

基金资助:* 国家重点基础研究发展计划2010CB630801资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.623 或 https://www.cjmr.org/CN/Y2014/V28/I4/274

图1 采用Thermo-Calc计算出的0.23C-1.9Mn-1.6Si 钢的温度—平衡相比例图

图2 0.23C-1.95Mn-1.62Si钢在900℃奥氏体化30 min后淬火所得的微观组织

表1 不同热处理工艺的相关参数(温度及时间)

表2 IQ&P、IQ&T和 Q&T钢的示波冲击数值

图3 IQ&P, IQ&T, Q&T三种不同工艺下钢的微观组织SEM形貌

图4 IQ&P, IQ&T, Q&T三种不同工艺下钢的示波冲击曲线

表3 分别经IQ&P、IQ&T 以及Q&T处理后钢的拉伸性能

图5 IQ&P、IQ&T和Q&T三种钢的瞬时加工硬化指数(ni)-真应变曲线

图6 不同冲击及拉伸形变下IQ&P钢的XRD谱

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