Effect of Strengthening Mechanism on Fatigue Properties of Hot-Rolled Sheet Steels

2002-01-0042

03/04/2002

Event
SAE 2002 World Congress & Exhibition
Authors Abstract
Content
The influence of tensile strength on fatigue strength and the effect of strengthening mechanism on fatigue notch factor were investigated into conventional mild steels, HSLA steels, DP steels and TRIP steels.
The grade of studied steels was altered from 440MPa to 780MPa. Not only smooth fatigue specimens with side surface ground and smooth fatigue specimens with laser-cut side surface but also fatigue specimens with a pierced hole were prepared for each of steel sheets. Fatigue tests were conducted in an axial load method.
These experiments made it clear that the fatigue limits of smooth specimen increase along the tensile strength approximately independent of strengthening mechanism but those of notched specimen do not necessarily increase along the tensile strength. Namely, fatigue limits of DP steels and TRIP steels with notch increase in proportion to tensile strength although those of HSLA steels with notch do not increase. Laser cut makes the side surface of specimen very rough compared to mechanical cut hereby fatigue limits of these steels decrease.
Meta TagsDetails
DOI
https://doi.org/10.4271/2002-01-0042
Pages
11
Citation
Yokoi, T., Takahashi, M., and Ikenaga, N., "Effect of Strengthening Mechanism on Fatigue Properties of Hot-Rolled Sheet Steels," SAE Technical Paper 2002-01-0042, 2002, https://doi.org/10.4271/2002-01-0042.
Additional Details
Publisher
Published
Mar 4, 2002
Product Code
2002-01-0042
Content Type
Technical Paper
Language
English