Retained Austenite Stability and Impact Performance of Advanced High Strength Steel at Reduced Temperatures

Paper #:
  • 2017-01-1707

Published:
  • 2017-03-28
Abstract:
Retained austenite stability to both mechanically induced transformation and athermal transformation is of great importance to the fabrication and in-vehicle performance of automotive advanced high strength steels. Selected cold-rolled advanced high strength steels containing retained austenite with minimum tensile strengths of 980 MPa and 1180 MPa were pre-strained to pre-determined levels under uniaxial tension in the rolling direction and subsequently cooled to temperatures as low as 77 K. Room temperature uniaxial tensile results of pre-strained and cooled steels indicate that retained austenite is stable to athermal transformation to martensite at all tested temperatures and pre-strain levels. To evaluate the combined effects of temperature and pre-strain on impact behavior, stacked Charpy impact testing was conducted on the same steels following similar pre-straining in uniaxial tension. A reduction in absorbed energy was observed with decreasing temperature and increasing pre-strain, indicating in combination with uniaxial tensile results that thermal effects on plasticity, not athermal transformation to martensite, account for the observed reductions in impact energy at reduced temperatures.
Also in:
  • SAE International Journal of Engines - V126-3EJ
  • SAE International Journal of Engines - V126-3
Sector:
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Select
Price
List
Download
$22.00
Mail
$22.00
Members save up to 36% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Standard
1992-12-01
Training / Education
2013-04-09
Standard
1987-05-01
Training / Education
2013-04-09
Technical Paper / Journal Article
2008-10-07
Technical Paper / Journal Article
2003-10-27
Training / Education
2013-04-09
Training / Education
2013-04-09