ISSN:
1013-9826
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 increasing demand for the reduction of automobiles CO2 emissions forenvironmental preservation leads the automotive industries towards the mechanical componentsweight reduction. Sheet steels with multiphase microstructures exhibit favourable combinations ofstrength and ductility. The so called TRIP steels have a metastable microstructure that consists of acontinuous ferrite matrix containing a dispersion of hard second phases martensite and bainite.These steels also contain retained austenite, at room temperature, that represents the source of theTRansformation Induced Plasticity effect. When the material is subjected to deformation step, theretained austenite transforms itself into martensite; the produced martensite delays the onset ofnecking resulting in a product with high total elongation, excellent formability and high crashenergy absorption. In the present research the steel TRIP 800 zinc coated has been subjected todifferent thermo–mechanical treatments in order to evaluate the relation between microstructure ofmaterial and TRIP effects. Whit this aim the microstructural analysis has been performed and theevaluation of content of different phases has been made by means of the image analysis techniques.The relation among the strain level, the content of different phases, the thermal treatments and thework hardening properties of materials have been valued. Furthermore, it has been also highlightedthe dependence of the bake hardening properties of material on the different thermo-mechanicaltreatments
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.71.pdf
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