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

Jogender Singh, C. M. Wayman

Research output: Contribution to journalArticle

12 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)227-233
Number of pages7
JournalMaterials Science and Engineering
Volume93
Issue numberC
DOIs
StatePublished - Jan 1 1987

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Fingerprint Dive into the research topics of 'Formation of secondary austenite during the α′-γ transformation in an FeNiMn alloy'. Together they form a unique fingerprint.

  • Cite this