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

• • 上一篇    下一篇

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   

  1. 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   

  1. 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:

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

图1

试验设备"

表1

45号钢化学成分"

成分CSiMnCrNiCu
质量分数/%0.42~0.500.17~0.370.50~0.80≤0.25≤0.30≤0.25

图2

正火45号钢金相组织图片"

图3

试验流程图"

图4

压痕曲线"

表2

计算所得的材料力学参数"

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)

14.1930.321221.567366.417
24.0890.342208.435284.905
34.3510.313198.843399.513
均值4.2110.325209.615350.278

第二组

(往复扭转 22.5°)

44.9640.311188.762385.806
54.4710.297179.658455.180
65.2010.269182.362569.3420
均值4.8790.292183.594470.109

第三组

(往复扭转 45°)

75.7210.221148.223689.0754
85.6880.199200.505763.245
95.0740.264140.808667.967
均值5.4940.228163.179706.762

图5

拉伸曲线"

图6

原位图像"

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