Characterization of the Formation and Growth of Carbides in Low Temperature Tempered (LTT) Advanced High-Strength Low-Alloy (HSLA) Steels
(Room 202A)
08 May 17
10:00 AM
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10:30 AM
Tracks:
New Developments & Detailed Microstructural Characterization of AHSS
Little work has been done to characterize the ultrafine epsilon nanocarbides found in low-temperature tempered HSLA and UHSLA steel. The experimental results shown in this paper were gathered from a low-temperature tempering study carried out on five different HSLA steels in an attempt to answer questions surrounding the effects of changes in alloy content and silicon levels on the stabilities of the intralath metastable transition epsilon carbides, cementite and alloy carbides. SEM work shows the progression of the carbide structures from the intralath epsilon carbide to cementite and finally to large alloy carbides at lath boundaries. In addition, the fine intralath metastable epsilon carbides responsible for the good combination of strength, ductility, and toughness were found to be present between the martensite laths of the tempered martensite microstructure in all five steels at low tempering temperatures.