Fatigue and fracture of a 316 stainless steel metal matrix composite reinforced with 25% titanium diboride

被引：41

作者：

Bacon, D. H. ^{[1
]}

Edwards, L. ^{[1
,2
]}

Moffatt, J. E. ^{[1
]}

Fitzpatrick, M. E. ^{[1
]}

机构：

[1] Open Univ, Milton Keynes MK7 6AA, Bucks, England

[2] Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2013年 / 48卷

基金：

英国工程与自然科学研究理事会;

关键词：

Metal matrix composites; Fatigue crack growth; Particle fracture; Fracture surface analysis; ALUMINUM-ALLOY COMPOSITES; CRACK-GROWTH; MISFIT STRESSES; TIB2; PARTICLES; BEHAVIOR; WEAR; STRAIN;

D O I：

10.1016/j.ijfatigue.2012.09.016

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue and fracture mechanisms have been studied in a steel-based metal matrix composite (MMC), comprising a 316L austenitic matrix reinforced with 25 wt.% particulate titanium diboride (TiB2). The fracture toughness was determined in the as-HIPped condition as being slightly below 30 MPa root m. Fatigue crack growth rates have been determined, and corrected for the effects of crack closure. The fracture surfaces have been studied to determine the mechanisms of damage during crack advance, which are determined as matrix fatigue, reinforcement particle fracture, and ductile rupture of the matrix. We show that the occurrence of damage mechanisms during fatigue of the material is linked to K-max, rather than to Delta K. This is rationalised in terms of a semi-cohesive process zone within the monotonic plastic zone ahead of the crack tip. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：39 / 47

页数：9

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[3]

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