Liquid-metal-induced fracture mode of martensitic T91 steels

被引：41

作者：

Martin, M. L. ^{[1
]}

Auger, T. ^{[2
]}

Johnson, D. D. ^{[1
,3
,4
]}

Robertson, I. M. ^{[1
]}

机构：

[1] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

[2] CNRS, ECP MSSMAT, UMR 8579, F-92290 Chatenay Malabry, France

[3] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA

[4] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2012年 / 426卷 / 1-3期

基金：

美国国家科学基金会; 欧盟第七框架计划;

关键词：

EMBRITTLEMENT; CRACK; ALLOYS; IRON; LME;

D O I：

10.1016/j.jnucmat.2012.03.040

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The liquid-metal-induced fracture mode of T91 martensitic steel was investigated by using transmission electron microscopy techniques to characterize the microstructure and crack network in specimens obtained from focused-ion beam machining at and immediately below the fracture surface. Contrary to previous claims of quasi-cleavage fracture, the dominant fracture mode is intergranular cracking at martensite laths and prior austenite grain boundaries. These fracture mode results clarify an outstanding issue in liquid-metal embrittlement of steels that generally occur in a heavily-deformed microstructure. Several cracks were arrested at intergranular carbides, suggesting a metallurgical strategy for impeding liquid-metal-induced crack propagation. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：71 / 77

页数：7

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