Formation of secondary austenite during the α′-γ transformation in an FeNiMn alloy

Jogender Singh; C. M. Wayman

doi:10.1016/0025-5416(87)90428-9

Formation of secondary austenite during the α′-γ transformation in an FeNiMn alloy

Jogender Singh, C. M. Wayman

Applied Research Laboratory (ARL)

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Abstract

Optical and electron microscopy have been employed to study structural changes in an FeNiMn martensite (α′) during heating. The reverse transformation (α′ → γ_s) occurs between 500 and 600°C and appears to be divided into three classes. The first is a long-range diffusional transformation which occurs by nucleation and growth. This type of reversion is observed on slow heating (5°C s^-1). The formation of secondary austenite (γ_s) is observed at the lath interfaces. The second is a short-range diffusional transformation observed on heating at intermediate rates (approximately 50°C s^-1) which results in a refined, equiaxed austenite and resembles a massive transformation. The third is a diffusionless transformation observed on fast heating (100°C s^-1) and appears to be martensitic in nature.

Original language	English (US)
Pages (from-to)	227-233
Number of pages	7
Journal	Materials Science and Engineering
Volume	93
Issue number	C
DOIs	https://doi.org/10.1016/0025-5416(87)90428-9
State	Published - Sep 1987

All Science Journal Classification (ASJC) codes

Engineering(all)

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10.1016/0025-5416(87)90428-9

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title = "Formation of secondary austenite during the α′-γ transformation in an FeNiMn alloy",

abstract = "Optical and electron microscopy have been employed to study structural changes in an FeNiMn martensite (α′) during heating. The reverse transformation (α′ → γs) occurs between 500 and 600°C and appears to be divided into three classes. The first is a long-range diffusional transformation which occurs by nucleation and growth. This type of reversion is observed on slow heating (5°C s-1). The formation of secondary austenite (γs) is observed at the lath interfaces. The second is a short-range diffusional transformation observed on heating at intermediate rates (approximately 50°C s-1) which results in a refined, equiaxed austenite and resembles a massive transformation. The third is a diffusionless transformation observed on fast heating (100°C s-1) and appears to be martensitic in nature.",

author = "Jogender Singh and Wayman, {C. M.}",

note = "Funding Information: This work was supported by the United States Army Research Office (Durham). Its support is gratefully acknowledged. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

year = "1987",

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T1 - Formation of secondary austenite during the α′-γ transformation in an FeNiMn alloy

AU - Singh, Jogender

AU - Wayman, C. M.

N1 - Funding Information: This work was supported by the United States Army Research Office (Durham). Its support is gratefully acknowledged. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.

PY - 1987/9

Y1 - 1987/9

N2 - Optical and electron microscopy have been employed to study structural changes in an FeNiMn martensite (α′) during heating. The reverse transformation (α′ → γs) occurs between 500 and 600°C and appears to be divided into three classes. The first is a long-range diffusional transformation which occurs by nucleation and growth. This type of reversion is observed on slow heating (5°C s-1). The formation of secondary austenite (γs) is observed at the lath interfaces. The second is a short-range diffusional transformation observed on heating at intermediate rates (approximately 50°C s-1) which results in a refined, equiaxed austenite and resembles a massive transformation. The third is a diffusionless transformation observed on fast heating (100°C s-1) and appears to be martensitic in nature.

AB - Optical and electron microscopy have been employed to study structural changes in an FeNiMn martensite (α′) during heating. The reverse transformation (α′ → γs) occurs between 500 and 600°C and appears to be divided into three classes. The first is a long-range diffusional transformation which occurs by nucleation and growth. This type of reversion is observed on slow heating (5°C s-1). The formation of secondary austenite (γs) is observed at the lath interfaces. The second is a short-range diffusional transformation observed on heating at intermediate rates (approximately 50°C s-1) which results in a refined, equiaxed austenite and resembles a massive transformation. The third is a diffusionless transformation observed on fast heating (100°C s-1) and appears to be martensitic in nature.

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JF - Materials Science and Engineering

SN - 0025-5416

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Formation of secondary austenite during the α′-γ transformation in an FeNiMn alloy

Abstract

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