基于纳米压痕分析的往复扭转载荷下45号钢的力学性能

doi:10.13229/j.cnki.jdxbgxb20180667

吉林大学学报(工学版) ›› 2019, Vol. 49 ›› Issue (3): 859-864.doi: 10.13229/j.cnki.jdxbgxb20180667

基于纳米压痕分析的往复扭转载荷下45号钢的力学性能

李聪(),赵宏伟(),孙琳琳

吉林大学机械与航空航天工程学院，长春 130022

收稿日期:2018-06-22 出版日期:2019-05-01 发布日期:2019-07-12
通讯作者: 赵宏伟 E-mail:congli13@ mails.jlu.edu.cn;hwzhao@jlu.edu.cn
作者简介:李聪（1983?），男，博士研究生.研究方向：多载荷原位力学性能测试装置的设计与试验.E?mail:congli13@ mails.jlu.edu.cn
基金资助:
国家重大科学仪器设备开发专项项目(2012YQ030075);国家自然科学基金优秀青年基金项目(51422503);国家自然科学基金项目(51275198);吉林省科技发展计划重大项目(20150203014GX);吉林省产业创新专项基金项目(2016C030);吉林省中青年科技创新人才与团队项目(20170519001JH)

Mechanical property of 45 steel under reciprocating torsional load based on nanoindentation analysis

Cong LI(),Hong⁃wei ZHAO(),Lin⁃lin SUN

Collegeof Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, China

Received:2018-06-22 Online:2019-05-01 Published:2019-07-12
Contact: Hong?wei ZHAO E-mail:congli13@ mails.jlu.edu.cn;hwzhao@jlu.edu.cn

摘要/Abstract

摘要：

通过自制的原位拉扭?压痕力学性能测试装置，开展了往复扭转后45号钢拉伸力学性能测试。首先，由纳米压痕试验分析并获得了往复扭转后45号钢的力学性能曲线及其弹性模量、硬度、屈服强度和应变硬化指数等参数的变化。然后，通过原位拉伸试验证实了纳米压痕试验计算45号钢力学性能的可行性。结果表明，拉伸试验和压痕试验计算获得的材料力学参数具有很好的一致性。本文通过原位图像，还进一步分析了材料在往复扭转载荷下的损伤机理，证实了试验结论的正确性，为通过纳米压痕试验获取服役状态下材料力学性能提供了试验依据。

关键词: 材料力学, 往复扭转, 纳米压痕, 原位拉伸, 损伤机理

Abstract:

The tensile properties of 45 steel after reciprocating torsion are tested by self?made in?situ tension?torsion?nanoindentation mechanical testing device.In this study, the mechanical properties curve of 45 steel after reciprocating torsion and the changes of its elastic modulus, hardness, yield strength and strain hardening exponent are obtained by Nano indentation test. The feasibility of calculating the mechanical properties of 45 steel by Nano indentation test is confirmed by in?situ tensile test. The mechanical parameters obtained by tensile test and indentation test are in good agreement. The damage mechanism of materials under reciprocating torsional loads is further analyzed by in?situ images, and the correctness of the experimental results is confirmed. The experimental basis is provided for obtaining the mechanical properties of materials by nanoindentation test in service.

Key words: material mechanics, reciprocating torsion, nano indentation, in?situtension, damage mechanism

中图分类号:

O341

李聪,赵宏伟,孙琳琳. 基于纳米压痕分析的往复扭转载荷下45号钢的力学性能[J]. 吉林大学学报(工学版), 2019, 49(3): 859-864.

Cong LI,Hong⁃wei ZHAO,Lin⁃lin SUN. Mechanical property of 45 steel under reciprocating torsional load based on nanoindentation analysis[J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(3): 859-864.

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组别	序号	硬度/GPa	硬化指数	弹性模量/GPa	屈服强度/MPa
第一组（未预扭转）	1	4.193	0.321	221.567	366.417
	2	4.089	0.342	208.435	284.905
	3	4.351	0.313	198.843	399.513
	均值	4.211	0.325	209.615	350.278
第二组（往复扭转 22.5°）	4	4.964	0.311	188.762	385.806
	5	4.471	0.297	179.658	455.180
	6	5.201	0.269	182.362	569.3420
	均值	4.879	0.292	183.594	470.109
第三组（往复扭转 45°）	7	5.721	0.221	148.223	689.0754
	8	5.688	0.199	200.505	763.245
	9	5.074	0.264	140.808	667.967
	均值	5.494	0.228	163.179	706.762

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基于纳米压痕分析的往复扭转载荷下45号钢的力学性能

Mechanical property of 45 steel under reciprocating torsional load based on nanoindentation analysis

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