EFFECT OF RESIDUAL STRESSES ON FATIGUE STRENGTH OF PLASMA NITRIDED 4140 STEEL

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AGHAZADEH JAMSHID; AMIDI M.R.

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Journal: AMIRKABIR Year:2004 | Volume:15 | Issue:58-D Page(s): 478-488

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Information Journal Paper

Title

EFFECT OF RESIDUAL STRESSES ON FATIGUE STRENGTH OF PLASMA NITRIDED 4140 STEEL

Author(s)

AGHAZADEH JAMSHID | AMIDI M.R. | Issue Writer Certificate

Keywords

RESIDUAL STRESSESQ4

INDENTATION STRAINQ4

AISI 4140 STEELQ4

PLASMA NITRIDINGQ3

Abstract

Almost every method that has been presented to determine residual stress has some limitation and complexities. The aim of this work is to present a new, yet simple method so called" strain indentation" for measuring the RESIDUAL STRESSES particularly in thin layers .In this method in addition to the precision measurements, components of residual stress at different directions may be determined. AISI 4140 STEEL specimens were plasma nitrided at 350°C, 450°C and 550°Cfor 5 hours in the mixture of 75% nitrogen - 25% hydrogen gas. The components of residual stress in the radials axial and hoop directions in the nitrided layer were determined considering the elastic strain recovery after removal of residual stress inducer (i.e. the nitrided layer). Fatigue strength of the nitrided specimens was obtained by plotting the S-N curves and fractographic studies carried out on the fracture surface of the specimens.The effect of residual stress on the stress pattern was simulated. The calculated residual stress components were in the range of 40-210 Mpa and the radial components of residual stress were more than the other two directions. Maximum fatigue strength improvement of up to 110% was observed in the plasma nitrided specimens at 550°C and also 40% improvement in fatigue strength was detected by increasing the nitriding temperature from 350°C to 550 C. This was due to 100% increase in residual stress. Fatigue crack growth velocity in the hoop direction was more than that of radial direction. This seems to be due to higher radial residual stress component compared with the hoop stress component in the sub layer.

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APA: Copy

AGHAZADEH, JAMSHID, & AMIDI, M.R.. (2004). EFFECT OF RESIDUAL STRESSES ON FATIGUE STRENGTH OF PLASMA NITRIDED 4140 STEEL. AMIRKABIR, 15(58-D), 478-488. SID. https://sid.ir/paper/846/en

Vancouver: Copy

AGHAZADEH JAMSHID, AMIDI M.R.. EFFECT OF RESIDUAL STRESSES ON FATIGUE STRENGTH OF PLASMA NITRIDED 4140 STEEL. AMIRKABIR[Internet]. 2004;15(58-D):478-488. Available from: https://sid.ir/paper/846/en

IEEE: Copy

JAMSHID AGHAZADEH, and M.R. AMIDI, “EFFECT OF RESIDUAL STRESSES ON FATIGUE STRENGTH OF PLASMA NITRIDED 4140 STEEL,” AMIRKABIR, vol. 15, no. 58-D, pp. 478–488, 2004, [Online]. Available: https://sid.ir/paper/846/en

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