Two microalloyed steels, 92V45 and 92V54, were evaluated under various conditions of austenitizing time and tempering time and temperature. It was found that tensile strength was a function of austenitizing time as well as tempering time and temperature. Higher strengths were observed at short austenitizing times due to finer prior austenite grain sizes. Both steels exhibited reductions in strength with increasing tempering temperature. These reductions were more significant at long tempering times than at short times. Good ductility was observed for 92V45 under all heat treating conditions, while 92V54 showed instances of significantly reduced ductility at short tempering times. Reduced ductility correlated with intergranular fracture and unstable crack initiation. Fracture toughness was found to increase with increases in both austenitizing time and tempering time and temperature. The results are correlated with the effects of heat treating cycle on martensite structure, prior austenite grain size, and carbide morphology.
Continous heat treatment of automotive suspension spring steels
Kontinuierliche Wärmebehandlung von Federstählen für Aufhängevorrichtungen im Automobilbau
1996
23 Seiten, 25 Bilder, 3 Tabellen, 16 Quellen
Conference paper
English
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