Tag Archives: strength

Axial and Bending Fatigue Performance of Shallow-Carburized SAE 8615 Steel

The previous blog examined the performance of SAE 8615 simulated-carburized steel in monotonic tensile tests and compared its performance in axial and bending fatigue conditions. This blog will explore the performance of SAE 8615 steel with a shallow-carburized case depth … Continue reading

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Fatigue Properties of Modified Steels Carburized at High Temperatures

The objective of phase XI is to compare the performance of carburized steel in bending and axial fatigue loading conditions. Carburization is a surface heat treatment process which adds carbon to the surface of a material to increase its hardness … Continue reading

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Neuber Stress Plots

This article explains how a “Neuber Stress” is calculated from fatigue test data obtained from un-notched axially-loaded specimen. In the presence of a geometric stress concentration feature on a part, the fatigue life of that part is often under-predicted as … Continue reading

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The Effect of Bainite on Strength and Fatigue in Through-Carburized SAE 8620 Test Bars

A case microstructure may consist of martensite, retained austenite and bainite, and depends upon alloy and cooling rate. The impact of bainite on fatigue is not well known.  Sometimes carburized parts are intentionally austempered to increase the amount of bainite … Continue reading

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Hardness versus Strength

There is a very good relationship between hardness and strength for steel. If the hardness is known the tensile strength can be estimated, and the reverse is also true. This relationship is valid for tensile strength but not for yield … Continue reading

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Strength and Fatigue Life versus Carbon Content at High Hardness (60 HRC)

The strength, fatigue and hardness data for several iterations with a high hardness level, around 60 HRC are shown in Table 1. The steels in these iterations are both plain carbon and low alloy grades with carbon contents ranging from … Continue reading

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