Tag Archives: hardness

Through Carburized 20MoCr4 Steel, 26-Hour Atmosphere Cycle versus 36-Hour Vacuum Cycle

Posted on April 10, 2018 by

In this article we will compare two through-carburized 20MoCr4 steel iterations. The composition of the 20MoCr4 steel is shown below in Table 1. Iteration #137 was atmosphere through carburized using the traditional 927 °C, twenty-six hour cycle which provides a … Continue reading →

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Atmosphere versus Vacuum Through-Carburized Boron Steels

Posted on February 15, 2018 by

In this article we will compare two through-carburized boron steels which were both atmosphere and vacuum heat treated. As in previous axial fatigue tests; approximately 30 test samples were prepared to ensure there were three replicate tests at a minimum … Continue reading →

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Hardness versus Fatigue Strength

Posted on August 8, 2017 by

In the previous article we examined the relationship between hardness and tensile strength for the AISI fatigue database iterations through 141. As the hardness increased the tensile strength also increased for a majority of the steels and the relationship was … Continue reading →

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Hardness versus Strength

Posted on July 11, 2017 by

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)

Posted on May 9, 2017 by

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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Effect of Cooling Rate after Carburizing on the Fatigue Properties of Carburized Steels

Posted on April 12, 2016 by

In earlier posts, the fatigue properties of various carburized low alloy steels were examined.  Both case and core properties were evaluated.  Since carburized components are manufactured in various section sizes, it can be expected that cooling rates in the cores … Continue reading →

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Comparison of Case Hardening by Carburizing Versus Surface Induction Hardening

Posted on November 10, 2015 by

In past postings, the case and core properties of case hardened steels have been discussed.  These discussions have included the fatigue properties of both carburized and surface induction hardened steels. Carburizing is usually employed on carbon or low alloy steels … Continue reading →

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If Fatigue Data is Not Available, Is There a Means of Estimating Fatigue Performance?

Posted on April 22, 2015 by

Detailed fatigue data for a given combination of steel grade and processing offers the best means of determining fatigue performance when designing an automotive component.  However, in some instances, where only mechanical properties and hardness are available, methods have been … Continue reading →

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Fatigue Performance As Measured By Fatigue Strength Quenched and Tempered Steels

Posted on November 12, 2013 by

In a recent posting, a comparison of the fatigue properties for normalized steels (163-259 BHN) showed that the strain-life curves fell within a rather narrow band, especially in the long-life regime.  It was pointed out that, under a circumstance such … Continue reading →

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