激光淬火对40CrNiMo高强度钢拉伸性能与断口形貌的影响

doi:10.3969/j.issn.1000-1093.2014.07.009

兵工学报 ›› 2014, Vol. 35 ›› Issue (7): 996-1002.doi: 10.3969/j.issn.1000-1093.2014.07.009

激光淬火对40CrNiMo高强度钢拉伸性能与断口形貌的影响

孔德军^1,2，张垒¹，付贵忠¹

(1.常州大学机械工程学院江苏常州 213016; 2.江苏省大型重载齿轮传动工程技术研究中心江苏常州 213012)

收稿日期:2013-08-26 修回日期:2013-08-26 上线日期:2014-09-05
作者简介:孔德军(1966—)男副教授硕士生导师
基金资助:
江苏省科技支撑计划(工业)项目(BE2012066)；中国学位与研究生教育学会研究课题项目(C1-2013Y07-051)

Effect of Laser Quenching on Tensile Properties and Fracture Analysis of 40CrNiMo High Strength Steel

KONG De-jun^{1, 2}, ZHANG Lei¹, FU Gui-zhong¹

(1.College of Mechanical Engineering, Changzhou University, Changzhou 213016, Jiangsu, China;2.Jiangsu Province Engineering Technology Research Center for Large Heavy Gear Transmission,Changzhou 213012, Jiangsu, China)

Received:2013-08-26 Revised:2013-08-26 Online:2014-09-05

摘要/Abstract

摘要： 利用CO₂激光对40CrNiMo高强度钢表面进行了淬火处理，通过拉伸对比试验分析了激光淬火处理对试样拉伸性能的影响，用扫描电镜和能谱分析仪观察了激光淬火前后试样断口形貌与化学成分组成，并对其断裂机理进行了探讨。结果表明：激光淬火后40CrNiMo的屈服强度、抗拉强度和伸长率分别提高了25.3%、24.4%和7.1%，而断面收缩率降低了7.6%，存在明显的屈服阶段，呈现出连续屈服特征；与原始试样相比，激光淬火后40CrNiMo的屈服强度和抗拉强度明显提高，拉伸断裂方式和分层现象没有明显改善，试样表面断口处孔隙率降低，呈现准解理形貌。

关键词: 材料科学基础学科, 激光淬火, 40CrNiMo, 拉伸性能, 材料断裂, 断口形貌

Abstract: The surface of 40CrNiMo high strength steel is treated with CO₂ laser, the effect of laser quenching on tensile property of the sample is investigated through the tensile comparative test, and the fracture morphologies of 40CrNiMo before and after surface laser quenching are analyzed by scanning electron microscope and energy dispersive spectrometer, respectively. The results show that the yield strength, tensile strength and elongation of 40CrNiMo steel after laser quenching are increased by 25.3%, 24.4% and 7.1%, respectively, while the section shrinkage is decreased by 7.6%. 40CrNiMo steel has obvious yield stage after laser quenching, showing a continuous yield feature. Compared with the primitive sample, the yield strength and tensile strength of 40CrNiMo steel after laser quenching increase, but there are no obvious improvements in the tensile failure mode and the delamination, and the quasi cleavage morphology and low porosity appear at the fracture near the surface of the sample after laser quenching.

Key words: basic disciplines of materials science, laser quenching, 40CrNiMo, tensile property, material fracture, fracture morphology

中图分类号:

孔德军，张垒，付贵忠. 激光淬火对40CrNiMo高强度钢拉伸性能与断口形貌的影响[J]. 兵工学报, 2014, 35(7): 996-1002.

KONG De-jun, ZHANG Lei, FU Gui-zhong. Effect of Laser Quenching on Tensile Properties and Fracture Analysis of 40CrNiMo High Strength Steel[J]. Acta Armamentarii, 2014, 35(7): 996-1002.

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激光淬火对40CrNiMo高强度钢拉伸性能与断口形貌的影响

Effect of Laser Quenching on Tensile Properties and Fracture Analysis of 40CrNiMo High Strength Steel

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