激光冲击处理超细晶粒高碳钢的微观组织和力学性能<sup>*</sup>

doi:10.11901/1005.3093.2014.694

材料研究学报

2015, Vol. 29

Issue (6): 469-474 DOI: 10.11901/1005.3093.2014.694

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激光冲击处理超细晶粒高碳钢的微观组织和力学性能^*

熊毅^1,²(

),李鹏燕¹,陈路飞¹,路妍¹,王俊北¹,任凤章^1,²

1. 河南科技大学材料科学与工程学院洛阳 471023
2. 有色金属共性技术河南省协同创新中心洛阳 471023

Microstructure and Mechanical Properties of Laser Shocked an Ultra-fine Grained High Carbon Steel

Yi XIONG^1,^2,^**(

),Pengyan LI¹,Lufei CHEN¹,Yan LU¹,Junbei WANG¹,Fengzhang REN^1,²

1. School of Materials Science and Engineering, Henan University of Science and Technology,Luoyang 471023, China
2. Henan Collaborative Innovation Center of Nonferrous Metals Generic Technology, Luoyang 471023, China

引用本文:

熊毅,李鹏燕,陈路飞,路妍,王俊北,任凤章. 激光冲击处理超细晶粒高碳钢的微观组织和力学性能^*[J]. 材料研究学报, 2015, 29(6): 469-474.
Yi XIONG, Pengyan LI, Lufei CHEN, Yan LU, Junbei WANG, Fengzhang REN. Microstructure and Mechanical Properties of Laser Shocked an Ultra-fine Grained High Carbon Steel[J]. Chinese Journal of Materials Research, 2015, 29(6): 469-474.

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摘要:

借助扫描电子显微镜(SEM)、透射电子显微镜(TEM)、微力材料拉伸试验机和显微硬度计等手段, 研究了超细晶粒高碳钢多道次激光冲击强化(LSP)处理后的微观组织演变和力学性能的变化规律。结果表明, 强激光诱导冲击波超高应变率变形使超细晶粒高碳钢微复相组织中等轴铁素体晶粒的直径和球化完全的渗碳体颗粒的粒径分别由400 nm和150 nm进一步细化至200 nm和100 nm左右, 使力学性能指标和显微硬度得到明显提高, 塑性指标也有一定程度的改善, 但是断口形貌由韧性断裂特征向准解理和韧性混合型断裂转变。

关键词 ：金属材料, 激光冲击处理, 超细晶粒高碳钢, 微观组织, 力学性能

Abstract：

Microstructure and mechanical properties of the ultra-fine grained high carbon steel Fe-0.8C after multiple laser shock processing (LSP) were investigated by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), mini-tensile tests and microhardness measurements. The results show that the ultrafine micro-duplex structure (ferrite+cementite) of the steel was obviously re?ned due to the ultra-high plastic strain induced by LSP. Equiaxed ferrite grains were refined from 400 nm to 200 nm and the particle diameter of cementite lamellae decreased from 150 nm to 100 nm. Accordingly, the strength and microhardness increased greatly and the plasticity was also improved. However, the tensile fracture morphology changed from typical ductile fracture to a mixture of quasi-cleavage and ductile fracture after LSP.

Key words： metallic materials laser shock processing ultra-fine grained high carbon steel microstructure mechanical properties

收稿日期: 2014-11-21

基金资助:^* 国家自然科学基金50801021和5120106,河南省高等学校青年骨干教师项目2011GGJS-070,江苏省光子制造科学与技术重点实验室开放基金GZ201204资助项目。

作者简介: 熊毅

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.694 或 https://www.cjmr.org/CN/Y2015/V29/I6/469

图1 微拉伸试样示意图(mm)

图2 超细晶粒高碳钢激光冲击前、后的微观组织形貌

图3 超细晶粒高碳钢激光冲击前、后的工程应力-应变曲线

图4 超细晶粒高碳钢激光冲击前、后的断口形貌

图5 超细晶粒高碳钢激光冲击后的显微硬度分布

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