Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 859-864.doi: 10.13229/j.cnki.jdxbgxb20180667

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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

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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

CLC Number: 

  • O341

Fig.1

Test equipment"

Table 1

Chemical element of 45 steel"

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

Fig.2

Metallographic structure image of normalized 45 steel"

Fig.3

Test process diagram"

Fig.4

Indentation Curves"

Table 2

Calculated mechanical parameters"

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

Fig.5

Tensile curves"

Fig.6

In-situ images"

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