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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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Tag Archives: fatigue
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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Tagged auto, automotive, business, energy, fatigue, industry, market, MPa, steel, strength, technology
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Mechanical Properties versus Carburization Depth
In this article we will examine the relationship between ultimate tensile strength, fatigue strength, and elongation versus the depth of carburization. The data for this comparison was taken from several iterations discussed in previous articles and shown in Table 1. … Continue reading
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Tagged business, carburization, Carburizing, Core, elongation, energy, fatigue, industry, market, mechanical properties, steel, technology
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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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Tagged bainite, elongation, fatigue, SAE 8620, strength, Surface Hardness
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2017 Bar Fatigue Blog – Year in Review
During 2017 the SMDI Bar Steel Fatigue sub-committee continued work on numerous studies, test protocols, as requested by the committee members who represent key ground vehicle OEMs and suppliers. The committee continues to concentrate test efforts on those steel grades … Continue reading
Carburized Case-Core Samples
In this article we will examine Iterations #62, #63 and #70. These are carburized samples with a case/core composite to simulate an actual carburized part. Until now, all of the carburized samples we have looked at have been through carburized … Continue reading
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
Additional Data on the Effects of Cooling Rate on the Overload Fatigue Properties of Carburized Steels
In the previous post (Dec. 30, 2016), the effects of cooling rate on both constant amplitude and overload core fatigue properties of a carburized Ni-Cr-Mo alloy steel (4320) were compared. As was noted, the study involved subjecting steel bars of … Continue reading
Effect of Steel Composition on the Case and Core Fatigue Properties of Low Alloy Carburized Steels
In earlier posts, limited data indicated that the fatigue properties of the cores of carburized components do not vary significantly with the composition of low alloy steels. There was evidence, however, that the fatigue properties of the cases of carburized … Continue reading
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Tagged 20MnCr5, fatigue, low alloy steels, SAE 4320, SAE 9310, Steel Composition
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