The Effects of Room Temperature Aging on Subsequent Bake-Hardening of Automotive Sheet Steels Aachen University of Technology

Format:

Conference/Event

Author/Creator:

Wüebbels, T., author.

Conference Name:

SAE 2002 World Congress & Exhibition (2002-03-04 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2002

Summary:

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

Notes:

Vendor supplied data

Publisher Number:

2002-01-0041

Access Restriction:

Restricted for use by site license