Startseite Effects of temperature on fatigue limits and fracture morphologies of 40Cr steels formed by warm extrusion
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Effects of temperature on fatigue limits and fracture morphologies of 40Cr steels formed by warm extrusion

  • Liu Wei und Kong Dejun
Veröffentlicht/Copyright: 3. November 2016
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 107 Heft 11

Abstract

A 40Cr steel was formed with warm extrusion under different temperatures, and the tensile fatigue limits after the warm extrusion were calculated according to the Roca rule. The metallographic microstructure and chemical compositions of the extrusion samples were analyzed with an optical microscope and photoelectric direct-reading spectrometer, respectively; the residual stress and residual austenite were investigated on a stress tester. The fracture morphologies were analyzed with a field-emission scanning electron microscope, and the mechanism by which the warm extrusion temperatures affected the fatigue fracture of the 40Cr steel was discussed. The results show that the grains are refined by warm extrusion at 550°C, the C weight fraction on the sample surface is 0.39%, and the compressive residual stress and content of residual austenite are −297 MPa and 5.3%, respectively, increasing the fatigue life of the samples. The grain sizes of the extrusion samples at 650 and 750°C are larger than those at 550°C, the corresponding C content of the sample surface is 0.39% and 0.38%, respectively, and the compressive residual stresses and contents of residual austenite decrease, leading to a decrease in the fatigue life. The fatigue strength of the samples by warm extrusion at 550, 650, and 750°C is 382, 412, and 385 MPa, respectively. The fracture morphology of the sample at 550°C is a dimple, while that at 650 and 750°C is a cleavage step and river pattern, respectively.

Keywords: Warm extrusion; 40Cr steel; Fatigue strength; Fracture morphology
*Correspondence address, Prof. Kong Dejun, Ph.D, Department of Mechanical manufacturing, Changzhou University, Gehu Road, Changzhou City 213164, P. R. China, Tel.: +86-051981169812, Fax: +86-051981169810, E-mail:

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Received: 2016-04-06
Accepted: 2016-07-18
Published Online: 2016-11-03
Published in Print: 2016-11-10

© 2016, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111426
Schlagwörter für diesen Artikel
Warm extrusion; 40Cr steel; Fatigue strength; Fracture morphology

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. In-situ annealing and computation study of cube texture development in a commercial aluminum alloy
  5. Dislocation dynamics modeling of plastic deformation in single-crystal copper at high strain rates
  6. Investigation of mechanical properties of tubular aluminum foams
  7. Dependence of microstructure, microhardness, tensile strength and electrical resistivity on growth rates for directionally solidified Zn-Al-Sb eutectic alloy
  8. Effects of temperature on fatigue limits and fracture morphologies of 40Cr steels formed by warm extrusion
  9. Synthesis of an oxidation-resistant SiC coating on graphite and modeling analysis with thermodynamics calculations
  10. Improved corrosion inhibition of 3-amino-1,2,4-triazole on mild steel electrode in HCl solution using surface nanocrystallization
  11. Chunky graphite formation in ductile cast irons: effect of silicon, carbon and rare earths
  12. Fabrication of 3D porous MoS2–GO nanocomposite monolith as a promising adsorbent
  13. Short Communications
  14. Two-stage method of synthesis of ultrafine powder of α-phase metallic cobalt
  15. Developing a multifunctional bio-ceramics composite based on β-tricalcium phosphate working as a single carrier for calcium supplement and low-dose drugs
  16. DGM News
  17. DGM News
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