PHASE CHEMISTRY AND PRECIPITATION REACTIONS IN MARAGING STEELS .1. INTRODUCTION AND STUDY OF CO-CONTAINING C-300 STEEL

被引：130

作者：

SHA, W ^{[1
]}

CEREZO, A ^{[1
]}

SMITH, GDW ^{[1
]}

机构：

[1] UNIV OXFORD, DEPT MAT, OXFORD, ENGLAND

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1993年 / 24卷 / 06期

关键词：

D O I：

10.1007/BF02668190

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This article introduces a series of studies of phase transformations in maraging steels. Atom-probe field-ion microscopy (APFIM) was the main research technique employed. Hardness measurements, transmission electron microscopy (TEM), and thermochemical calculations were also used. The composition and morphology of precipitates in the commercial-grade C-300 steel were compared for different aging times at 510-degrees-C to investigate the aging sequence. Both Ni3Ti and Fe7Mo6 were found to contribute to age hardening. The decomposition starts with the formation of small Mo-enriched Ni3Ti particles at very short aging times. The Fe7Mo6 phase forms at a later stage of aging. The matrix concentrations of both Ti and Mo were measured and were found to be low after standard aging conditions. The observation of the Fe7Mo6 mu phase is supported by thermochemical calculations. Austenite reversion has been found at the aging temperature, and its composition approaches the predicted equilibrium composition after 8 hours of aging.

引用

页码：1221 / 1232

页数：12

共 32 条

[1]

[Anonymous], 1988, MARAGING STEELS RECE

[2] ANALYSIS OF NANOMETER-SIZED PRECIPITATES USING ATOM PROBE TECHNIQUES [J].