Browse Publications Technical Papers 2002-01-0041
2002-03-04

The Effects of Room Temperature Aging on Subsequent Bake-Hardening of Automotive Sheet Steels 2002-01-0041

Bake-hardening steels used for exposed auto-body panels provide low yield strengths before forming, and increased strength and dent resistance after the forming and paint-baking processes. Room temperature aging can alter the sheet properties before forming, after forming, or after baking. Knowledge of the evolution of mechanical properties is important, and the effects of room temperature and simulated room temperature aging (at 50°C and 100°C) on the yielding behavior and the bake hardening response of two different bake-hardening steel grades were studied. The steels included a low strength ultra-low carbon steel and a dual-phase steel with higher strength and greater bake-hardening index. Neither steel exhibited a substantial response to aging prior to tensile pre-straining, although both steels exhibited strength increases after either aging or baking following straining. The total strengthening increment was essentially independent of aging history for both steels, and followed t2/3 kinetics, with an apparent activation energy somewhat greater than the activation energy for carbon diffusion in ferrite.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Dent-Resistant Brake-Hardening Steels for Automotive Outer-Body Applications

910290

View Details

TECHNICAL PAPER

Numerical and Experimental Investigation of Strain-Path Effects on Localized Deformation in Steel Alloys

2005-01-0081

View Details

TECHNICAL PAPER

GM 980X - Potential Applications and Review

770211

View Details

X