中碳微合金钢的断裂韧性与显微组织的关系

材料导报

2020, Vol. 34

Issue (Z1): 452-456

金属与金属基复合材料

中碳微合金钢的断裂韧性与显微组织的关系

姚三成^1,2, 丁毅³, 赵海^1,2, 江波^1,2, 刘学华^1,2, 方政^1,2

1 高性能轨道交通新材料及安全控制安徽省重点实验室,马鞍山 243000;
2 马鞍山钢铁股份有限公司技术中心,马鞍山 243000;
3 马钢(集团)控股有限公司,马鞍山 243000

Correlation of Fracture Toughness with Microstructure in MicroalloyedMedium Carbon Steel

YAO Sancheng^1,2, DING Yi³, ZHAO Hai^1,2, JIANG Bo^1,2, LIU Xuehua^1,2, FANG Zheng^1,2

1 Anhui Province Key Laboratory of High-performance Rail Transportation New Materials and Safety Control, Ma'anshan 243000, China;
2 Technology Center, Ma'anshan Iron & Steel Co., Ltd., Ma'anshan 243000, China;
3 Magang (Group) Holding Co., Ltd., Ma'anshan 243000, China

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摘要通过断裂韧性与硬度测试,结合定量金相、电子探针(EPMA)、扫描电镜(SEM)、透射电镜(TEM)等,建立了含钒0.10%(质量分数)50Mn钢的断裂韧性与显微组织的关系。结果表明,解理断裂韧性与原奥氏体晶粒尺寸呈负相关关系,晶粒的细化及均匀化能显著提高钢的断裂韧性,可作为重要的控制中碳微合金钢强韧配合关系的组织参量单元。细小均匀的晶粒和未溶的第二相粒子还可使铁素体的形核点增多,从而提高先共析铁素体的体积分数,进一步增大裂纹扩展阻力。

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	姚三成
	丁毅
	赵海
	江波
	刘学华
	方政

关键词: 中碳微合金钢断裂韧性解理晶粒尺寸第二相

Abstract: The fracture toughness and hardness of 50Mn steel containing 0.10% (mass fraction) vanadium were tested. The microstructure was observed by using the quantitative metallography, electron probe microanalysis (EPMA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the correlation of fracture toughness with microstructure was established. The results indicate that cleavage fracture toughness is negatively correlated with prior austenite grain size, the refinement and homogenization of the grains can improve significantly the fracture toughness, which can be used as an important microstructural parameter unit to control the strength and toughness of microalloyed medium carbon steel. The fine and uniform grains and insoluble secondary phases also increase the nucleation sites for ferrite, thus increasing the volume fraction of proeutectoid ferrite, and further enhancing the cracks propagation resistance.

Key words: microalloyed medium carbon steel fracture toughness cleavage grain size secondary phases

发布日期: 2020-07-01

ZTFLH:

TG142.1

基金资助: 安徽省科技重大专项计划项目(201903a05020052)

作者简介: 姚三成,1991年8月生,硕士,2016年毕业于中南大学材料工程专业,现就职于马鞍山钢铁股份有限公司技术中心,主要从事轨道交通关键零部件的研究与开发。公开发表学术论文8篇,申请国家发明专利9项,其中授权4项。

引用本文:

姚三成, 丁毅, 赵海, 江波, 刘学华, 方政. 中碳微合金钢的断裂韧性与显微组织的关系[J]. 材料导报, 2020, 34(Z1): 452-456.
YAO Sancheng, DING Yi, ZHAO Hai, JIANG Bo, LIU Xuehua, FANG Zheng. Correlation of Fracture Toughness with Microstructure in MicroalloyedMedium Carbon Steel. Materials Reports, 2020, 34(Z1): 452-456.

链接本文:

http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2020/V34/IZ1/452

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