Aging behaviour of cobalt free chromium containing maraging steels

A. Gemperle; J. Gemperlová; W. Sha; G. D.W. Smith

doi:10.1179/mst.1992.8.6.546

Aging behaviour of cobalt free chromium containing maraging steels

A. Gemperle, J. Gemperlová, W. Sha, G. D.W. Smith

School of Natural and Built Environment

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

This paper reports an investigation of the aging behaviour of two Co free Cr containing maraging steels (Fe–1.0Si–11.2Cr–1.3Mo–9.1Ni–1.2Al–1.0Ti and Fe–0.8Si–17.2Cr–6.1Ni–0.4Al–0.9Ti, all at.-%), using hardness measurements, electron microscopy of replicas and thin foils, atom probe field ion microscopy (APFIM), and thermochemical calculations. Two different families of intermetallic phases (Ti₆Si₇Ni₁₆G phase and η Ni₃Ti) have been found to contribute to age hardening. The composition and morphology of these precipitates were studied in deformed and undeformed alloys after aging at 420–570°C for various times. In addition, reverted austenite has been found in the aged structure. Results obtained using APFIM are compared with equilibrium thermodynamic calculations and previous APFIM studies of conventional Cr free low Al and Si maraging steels having higher Mo contents.

Original language	English
Pages (from-to)	546-554
Number of pages	9
Journal	Materials Science and Technology (United Kingdom)
Volume	8
Issue number	6
DOIs	https://doi.org/10.1179/mst.1992.8.6.546
Publication status	Published - 1992

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1179/mst.1992.8.6.546

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title = "Aging behaviour of cobalt free chromium containing maraging steels",

abstract = "This paper reports an investigation of the aging behaviour of two Co free Cr containing maraging steels (Fe–1.0Si–11.2Cr–1.3Mo–9.1Ni–1.2Al–1.0Ti and Fe–0.8Si–17.2Cr–6.1Ni–0.4Al–0.9Ti, all at.-%), using hardness measurements, electron microscopy of replicas and thin foils, atom probe field ion microscopy (APFIM), and thermochemical calculations. Two different families of intermetallic phases (Ti6Si7Ni16G phase and η Ni3Ti) have been found to contribute to age hardening. The composition and morphology of these precipitates were studied in deformed and undeformed alloys after aging at 420–570°C for various times. In addition, reverted austenite has been found in the aged structure. Results obtained using APFIM are compared with equilibrium thermodynamic calculations and previous APFIM studies of conventional Cr free low Al and Si maraging steels having higher Mo contents.",

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AU - Gemperle, A.

AU - Gemperlová, J.

AU - Sha, W.

AU - Smith, G. D.W.

PY - 1992

Y1 - 1992

N2 - This paper reports an investigation of the aging behaviour of two Co free Cr containing maraging steels (Fe–1.0Si–11.2Cr–1.3Mo–9.1Ni–1.2Al–1.0Ti and Fe–0.8Si–17.2Cr–6.1Ni–0.4Al–0.9Ti, all at.-%), using hardness measurements, electron microscopy of replicas and thin foils, atom probe field ion microscopy (APFIM), and thermochemical calculations. Two different families of intermetallic phases (Ti6Si7Ni16G phase and η Ni3Ti) have been found to contribute to age hardening. The composition and morphology of these precipitates were studied in deformed and undeformed alloys after aging at 420–570°C for various times. In addition, reverted austenite has been found in the aged structure. Results obtained using APFIM are compared with equilibrium thermodynamic calculations and previous APFIM studies of conventional Cr free low Al and Si maraging steels having higher Mo contents.

AB - This paper reports an investigation of the aging behaviour of two Co free Cr containing maraging steels (Fe–1.0Si–11.2Cr–1.3Mo–9.1Ni–1.2Al–1.0Ti and Fe–0.8Si–17.2Cr–6.1Ni–0.4Al–0.9Ti, all at.-%), using hardness measurements, electron microscopy of replicas and thin foils, atom probe field ion microscopy (APFIM), and thermochemical calculations. Two different families of intermetallic phases (Ti6Si7Ni16G phase and η Ni3Ti) have been found to contribute to age hardening. The composition and morphology of these precipitates were studied in deformed and undeformed alloys after aging at 420–570°C for various times. In addition, reverted austenite has been found in the aged structure. Results obtained using APFIM are compared with equilibrium thermodynamic calculations and previous APFIM studies of conventional Cr free low Al and Si maraging steels having higher Mo contents.

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JO - Materials Science And Technology

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Aging behaviour of cobalt free chromium containing maraging steels

Abstract

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