Paper Title:
A study of Carbon and Nitrogen Free New Alloys with Superior Creep Properties More over 700°C
  Abstract

In order to improve the creep strength of the heat resistant steels at elevated temperatures over 700°C, a new attempt has been demonstrated using carbon and nitrogen free Fe-Ni martensitic and austenitic alloys strengthened by Laves phase such as Fe2W and Fe2Mo. It is important that these alloys are independent of any carbides and any carbo-nitrides as strengthening factors. The high temperature creep tests over 700°C exceed 36,000 hours and the test is continued. Creep behavior of alloys is found to be completely different from that of the conventional high-Cr ferritic steels. The alloys exhibit gradual change in the creep rate with strain both in the transient and acceleration creep regions, and give a larger strain for the minimum creep rate. Effect of Cr on the Fe-12Ni-9Co-10W alloys on the creep properties more over 700°C was investigated. It became clear that the value for 100,000 hours was exceeded at 700°C and 100MPa calculated from the Larson-Miller parameter at C=20. And surface appearance of crept specimen was investigated in detail.

  Info
Periodical
Key Engineering Materials (Volumes 345-346)
Edited by
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
Pages
593-596
DOI
10.4028/www.scientific.net/KEM.345-346.593
Citation
S. Muneki, H. Okubo, F. Abe, "A study of Carbon and Nitrogen Free New Alloys with Superior Creep Properties More over 700°C ", Key Engineering Materials, Vols. 345-346, pp. 593-596, 2007
Online since
August 2007
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Price
$32.00
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