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:
X20CrMoV12 1 steels were exposed at three different high temperatures and variousdurations. Aging parameter, LMP 〈sub〉s〈/sub〉, was used to describe long-term thermal history. Creep rupture, hardness and tensile tests for aged X20CrMoV12 1 steels were carried out. Yield strength was slightly decreased and hardness was rapidly decreased afterLMP 〈sub〉s〈/sub〉 reached 20.6. Creep strength of aged X20CrMoV12 1 steel decreased rapidly after the LMP〈sub〉s〈/sub〉 reached 20.6. It was shown that the creep strength decreased due to the coarsening of acicular type M〈sub〉23〈/sub〉C〈sub〉6〈/sub〉 at subgrain boundaries and the agglomeration of M〈sub〉23〈/sub〉C〈sub〉6〈/sub〉 at prior austenite grain boundaries. After LMP〈sub〉s〈/sub〉 reached 20.6, the assumed linear regression line of stress and Larson-Miller parameter,LMP〈sub〉f〈/sub〉, also moved toward alower LMP〈sub〉f〈/sub〉 region as aging parameter increased. The dependency of creep rupture life on the microstructural degradation could be represented by C〈sub〉LMPs〈/sub〉, which is LMP〈sub〉f〈/sub〉 at stress of 1 kg/mm〈sup〉2〈/sup〉. It was found that the creep rupture life of X20CrMoV12 1 steel could be predicted by considering the material degradation during and prior to creep test
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.537.pdf
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