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:
Three types of austenitic stainless steels JK2, JJ1 and JN1 were isothermally aged at temperaturesfrom 600 to 900°C for 10 to 1000 minutes in order to study the microstructural evolution and itseffect on the fracture toughness at cryogenic temperatures. The Charpy V-Notch fracture energy at77 K showed a significant decrease with aging time in JJ1 and JN1 steels because of their highercontents of C and N. In contrast, the fracture energy corresponding to the aged JK2 steel decreasedgradually with aging time. The abundant intergranular precipitation of carbides and nitrides seemsto be the responsible for the fracture toughness deterioration in the aged JJ1 and JN1 steels. On theother hand, the intergranular precipitation of carbides was less abundant in the aged JK2 steel. Thescanning electron microscope fractographs of the CVN test specimens corresponding to the agedJJ1 and JN1 steels showed mainly an intergranular brittle fracture and its fraction increased withaging time and temperature. In general, the presence of a more abundant intergranular precipitationresulted in a more rapid decrease in toughness with aging time
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4914.pdf
Permalink