QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 2434-8252
Print ISSN : 0288-4771
Modeling of effects of temperature and alloying elements on sigma phase precipitation rate in duplex stainless steel
-(Effects of alloying elements on sigma phase precipitation in duplex stainless steel)
Kazuhiro OGAWATakahiro OSUKI
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2015 Volume 33 Issue 1 Pages 55-61

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Abstract

The precipitation and growth of sigma phase in duplex stainless steel was investigated to clarify the quantitative effects of temperature and chemistry on growth rate in isothermal heating process. Intermetallic phase such as sigma phase is harmful for mechanical properties of duplex stainless steels. The increasing of alloying elements of Cr and Mo useful for improving of corrosion resistance promotes the sigma phase precipitation but that phase is not always formed rapidly. So it is meaningful to clarify the kinetics of precipitation to give the solution the trade off relation of high corrosion resistance and prevention of harmful phase precipitation.
A physical model of growth rate as function of temperature including the parameter regarding chemistries was suggested on the basis of traditional nucleation theory. The measurement of sigma phase conducted experimentally after heated at various temperature, employing 25%Cr duplex stainless steel containing various level of molybdenum, tungsten and nickel contents. Referring those data obtained, it was confirmed that the effects of temperature and molybdenum, tungsten and nickel contents on the growth rate is explained by the physical model suggested in this work.

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© 2015 by JAPAN WELDING SOCIETY
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