Effect of ageing on phase evolution and mechanical properties of a high tungsten super-duplex stainless steel

被引：52

作者：

Akisanya, Alfred R. ^{[1
]}

Obi, Udoka ^{[1
]}

Renton, Neill C. ^{[1
]}

机构：

[1] Univ Aberdeen, Sch Engn, Aberdeen AB24 3UE, Scotland

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 535卷

关键词：

Electron microscopy; Mechanical characterisation; Hardness measurement; Stainless steel; Intermetallics; Isothermal ageing; Phase transformation; Precipitation; Hardness; Failure; Strength; SIGMA-PHASE; MICROSTRUCTURAL STABILITY; PRECIPITATION; TEMPERATURE; MORPHOLOGIES; TOUGHNESS; CORROSION; BEHAVIOR; KINETICS;

D O I：

10.1016/j.msea.2011.12.087

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of ageing temperature and holding time on the precipitation of secondary phases and the mechanical properties of a 25Cr-6.7Ni-0.32N-3.0Mo-2.5W super duplex stainless steel is examined. The ageing temperature was varied from 600 to 900 degrees C and the holding time was varied from 1 to 240 min. Two types of Cr and Mo enriched intermetallic phases, sigma (sigma) and chi (chi), were found to precipitate preferentially at the ferrite/austenite interface and within the ferrite grain. The precipitation of the chi-phase occurred preferentially before the sigma-phase. The concentration of these secondary phases, which was quantified by a combination of microscopy and image analysis, increases with increasing ageing temperature and holding time, leading to significant reduction in the uniform strain and enhancement of the modulus, hardness and yield and tensile strengths. The measured concentration of the precipitated sigma phase is in agreement with the prediction by the Johnson-Mehl-Avrami kinetic model. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：281 / 289

页数：9

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