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The Long Products Market Development Group (LPMDG), formed in 1997, provides a unique forum for long products steel producers. Through the support of Steel Market Development Institute, the LPMDG is growing the market for value-added steel bar and rod products. With member companies and task forces--Automotive/Heavy Equipment and Construction/ Infrastructure--the group is committed to developing innovative solutions to the challenges facing their clients and the steel industry.
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Southfield, MI 48075
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Tag Archives: bainite
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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Tagged bainite, elongation, fatigue, SAE 8620, strength, Surface Hardness
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Additional Data on the Effect of Cooling Rate on the Fatigue Properties of Carburized Steels
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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Tagged bainite, carburized steels, cooling rate, fatigue, ferrite, low alloy steels, microstructure, Ni-Cr-Mo
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Effect of Cooling Rate after Carburizing on the Fatigue Properties of Carburized Steels
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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Tagged bainite, Carburizing, cooling rate, fatigue, ferrite, hardness, low alloy steels, martensite, microstructure, tensil
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Comparison of Case Hardening by Carburizing Versus Surface Induction Hardening
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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Tagged bainite, carburized steels, ferrite, hardness, martensite, mechanical properties, SAE 1070 steel, SAE 4620 steel
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Comparison of Through-Induction Hardening with Conventional Hardening
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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Tagged austenitizing, bainite, fatigue, ferrite, hardening, low alloy steels, medium carbon steel, SAE 4140
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Hot Formed and Controlled Cooled Microalloyed Steels Compared to Quenched and Tempered Medium Carbon Steels
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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Tagged 15V24 steel, bainite, carbon, fatigue, manganese, martensite, microalloyed steel, SAE 1038, vanadium
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Effect of Continuous Casting Practice on the Case and Core Properties of Carburized Alloy Steels
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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Tagged bainite, billets, fatigue, martensite, SAE 4620 steel, strain-controlled fatigue
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Comparison of the Case and Core Properties of Carburized Steels
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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Tagged bainite, carburized steels, Case hardening, fatigue, high hardness, induction, induction hardened steels, martensite, strain-life
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Further Comparisons of the Case and Core Properties of Induction Hardened Steels
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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Tagged bainite, fatigue, induction, martensite, pearlite, SAE 1070 steel, strain-controlled
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