Quantitative explanation of transient growth of [alpha] phase during dissolution in [gamma]/[alpha]/[gamma] diffusion couples of the Fe-Cr-Ni system using analytical solution

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90503-7· OSTI ID:7105103

Kajihara, Masanori; Kikuchi, Makoto ^[1]

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1. Tokyo Inst. of Tech. (Japan). Dept. of Metallurgical Engineering

In order to understand the general characteristics of the dissolution kinetics in multicomponent systems, a dissolution reaction of body-centered-cubic (b.c.c.) [alpha]-ferrite in face-centered-cubic (f.c.c.) [gamma]-austenite matrix of Cr-Ni stainless steels was chosen as a model case and was investigated in a series of studies by the present authors using [gamma]/[alpha]/[gamma] diffusion couples of the ternary Fe-Cr-Ni system. Before diffusion zones start to overlap either in the [alpha] phase or in the [gamma] phase, each half part of the [gamma]/[alpha]/[gamma]diffusion couple can be treated as a semi-infinite [alpha]/[gamma] diffusion couple. The stage, during which this treatment is valid, is hereafter called the first stage of the reaction. In this stage of the reaction, the migration of the [alpha]/[gamma] interface can be described mathematically using an analytical solution of diffusion equations for a semi-infinite two-phase diffusion couple of ternary systems. In the present article, the analytical solution was utilized to describe the migration velocity of the interface and the concentration profiles of the solutes in the [gamma]/[alpha]/[gamma] diffusion couple in the first stage of the reaction. The transient increase in the thickness of the [alpha] phase with increasing annealing time in this stage could be quantitatively reproduced by the calculation using the analytical solution.

• OSTI ID: 7105103
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:7; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
DATA
DATA ANALYSIS
HIGH ALLOY STEELS
INFORMATION
INTERFACES
IRON ALLOYS
IRON BASE ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
PHASE STUDIES
STAINLESS STEELS
STEELS
THEORETICAL DATA