ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The hot deformation behaviour of two high-Mn (23-24 wt-%) TWIP steels containing 6and 8 wt-% Al with the fully austenitic and duplex microstructures, respectively, has beeninvestigated at temperatures of 900-1100°C. In addition, tensile properties were determined over thetemperature range from -80 to 100°C. It was observed that in spite of the lower Al content, theaustenitic steel possessed the hot deformation resistance about twice as high as that of the duplexsteel. Whereas the flow stress curves of the austenitic steel exhibited work hardening followed byslight softening due to dynamic recrystallisation, the duplex steel showed the absence of workhardening and discontinuous yielding under similar conditions. Tensile tests at low temperaturesrevealed that the austenitic grade had a lower yield strength than that of the duplex grade, but muchbetter ductility, the elongation increasing with decreasing temperature, contrary to that for theduplex steel. This can be attributed to the intense mechanical twinning in the austenitic steel, whilein the duplex steel, twinning occurred in the ferrite only and the austenite showed dislocation glide
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.217.pdf
Permalink