Tag Archives: bainite

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

Posted on March 13, 2018 by

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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Additional Data on the Effect of Cooling Rate on the Fatigue Properties of Carburized Steels

Posted on May 10, 2016 by

In the previous post, the effects of a cooling rate change after carburizing, due to a change in steel bar diameter, on core fatigue properties was examined.  The data was developed for a Ni-Cr-Mo low alloy steel (SAE 4320), and … 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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Comparison of Through-Induction Hardening with Conventional Hardening

Posted on September 8, 2015 by

Two methods are often used to through harden and low alloy steels.  The well recognized conventional hardening method involves heating to an appropriate austenitizing temperature for a specific length of time in a furnace with or without a protective atmosphere. This … Continue reading →

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Hot Formed and Controlled Cooled Microalloyed Steels Compared to Quenched and Tempered Medium Carbon Steels

Posted on August 11, 2015 by

Microalloyed steels are often used in the as-formed or as-forged condition in applications where the use of medium carbon steels would require that the component be quenched and tempered.  Microalloyed steels, which contain small additions of niobium and/or vanadium, therefore … Continue reading →

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Effect of Continuous Casting Practice on the Case and Core Properties of Carburized Alloy Steels

Posted on September 25, 2012 by

In the previous posting, the strain-controlled fatigue properties of the high-hardness case and low-hardness core of carburized SAE 4620 steel were compared.  It was shown that at short lives, the softer core exhibited better properties than the high-hardness case.  At … Continue reading →

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Comparison of the Case and Core Properties of Carburized Steels

Posted on August 27, 2012 by

In recent postings, the strain-controlled fatigue properties of the high-hardness case and low-hardness core of induction hardened steels were compared.  It was shown that at short lives, the softer core outperformed the high-hardness case.  At long life, the fatigue properties … Continue reading →

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Further Comparisons of the Case and Core Properties of Induction Hardened Steels

Posted on August 2, 2012 by

In the last posting, the fatigue properties of surface induction hardened 1050 axle shafts were presented.  Strain life data showed that in the short life regime, the fatigue properties of the low hardness core were better than those of the … Continue reading →

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