Effect of nickel and tin additions on formation of liquid phase in copper bearing steels during high temperature oxidation
Source: Materials Science and Technology, Volume 15, Number 11, November 1999 , pp. 1301-1307(7)
Publisher: Maney Publishing
Abstract:It is well known that nickel is a beneficial alloying element in copper bearing steels as it prevents hot shortness. On the other hand, the addition of tin promotes hot shortness. Though some mechanisms for promoting these phenomena have been suggested, a quantitative discussion has still failed to establish the cause. In the present study, changes in the composition in the vicinity of the scale/metal interface owing to high temperature oxidation were experimentally determined using pure irons with copper, nickel, and tin additions. The experimental findings, such as the fraction of liquid phase and the change in composition in the progress of scale formation, were then explained by thermodynamic considerations using the Fe–Cu–Ni and Fe–Cu–Sn phase diagrams calculated from a computerised thermodynamic database. The thermodynamic considerations were also applied to a quantitative discussion on hot shortness and some measures for preventing hot shortness of copper bearing steels were suggested.
Document Type: Regular Paper
Affiliations: 1: The Production Control Division, Hikari Works, Nippon Steel Corp.,, Japan 2: The Yawata Research and Development Laboratories, Nippon Steel Corp.,, 1-1 Tobihatcho Tobata-ku, Kitakyusyuu City, 804, Japan 3: The Materials Engineering Department, Kyushu Institute of Technology, Japan
Publication date: 1999-11-01
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