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Journal of Materials Science

, Volume 54, Issue 17, pp 11703–11712 | Cite as

Ratcheting life prediction of quenched–tempered 42CrMo4 steel

  • R. Kreethi
  • Chinnam Sivateja
  • A. K. Mondal
  • Krishna DuttaEmail author
Metals & corrosion
  • 112 Downloads

Abstract

A series of ratcheting tests on quenched–tempered 42CrMo4 steel with varying combinations of mean stresses and stress amplitudes were conducted at room temperature till failure. The ratcheting lives of the steel at different stresses were estimated using a few existing stress-based life prediction equations. A stress-based life prediction model was newly proposed. The experimental results revealed that ratcheting strain monotonically increased with mean stress and stress amplitude for all employed test parameters. The steel showed predominantly cyclic softening feature. The newly proposed model predicted ratcheting life efficiently in the life range of 102–104 cycles with a life factor of 1. It also efficiently predicted the fatigue life of other materials. Fractographic examinations revealed the standard fatigue fracture features.

List of symbols

σa

Stress amplitude

σm

Mean stress

σmax

Maximum applied stress

σmin

Minimum applied stress

R

Stress ratio

σu

Ultimate tensile strength

σy

Yield strength

N

Number of cycles

Nf

Number of cycles to failure

σf

Fatigue strength coefficient for the Basquin’s equation

b

Fatigue strength exponent for the Basquin’s equation

σaeq

Equivalent stress amplitude

γ

Material constant (Walker exponent)

εrf

Ratcheting strain at 90% of fatigue life

σpl

Plastic flow stress

n

Fatigue strength exponent for the proposed equation

C

Fatigue strength coefficient for the proposed equation

n

Cyclic strain-hardening exponent

Notes

Acknowledgements

The authors gratefully acknowledge the help and support provided by the National Institute of Technology, Rourkela–769008, India, to conduct this research.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Metallurgical and Materials EngineeringNational Institute of Technology, RourkelaRourkelaIndia
  2. 2.Department of Metallurgical EngineeringIndian Institute of Technology (BHU) VaranasiVaranasiIndia

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