Role of Different Kinds of Boundaries Against Cleavage Crack Propagation in Low-Temperature Embrittlement of Low-Carbon Martensitic Steel

被引：21

作者：

Tsuboi, Mizuki ^{[1
]}

Shibata, Akinobu ^{[1
,2
]}

Terada, Daisuke ^{[3
,4
]}

Tsuji, Nobuhiro ^{[1
,2
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan

[2] Kyoto Univ, Elements Strategy Initiat Struct Mat, Sakyo Ku, Kyoto 6068501, Japan

[3] Chiba Inst Technol, Dept Mech Sci & Engn, Narashino, Chiba 2750016, Japan

[4] Kyoto Univ, Elements Strategy Initiat Struct Mat, Kyoto, Japan

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2017年 / 48A卷 / 07期

基金：

日本学术振兴会;

关键词：

DUCTILE-BRITTLE TRANSITION; FE-C ALLOYS; LATH MARTENSITE; ORIENTATION RELATIONSHIP; MECHANICAL-PROPERTIES; MORPHOLOGY; CRYSTALLOGRAPHY; AUSTENITE; BAINITE; GRAIN;

D O I：

10.1007/s11661-017-4107-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present paper investigated the relationship between low-temperature embrittlement and microstructure of lath martensite in a low-carbon steel from both microstructural and crystallographic points of view. The fracture surface of the specimen after the miniaturized Charpy impact test at 98 K (-175 A degrees C) mainly consisted of cleavage fracture facets parallel to crystallographic {001} planes of martensite. Through the crystallographic orientation analysis of micro-crack propagation, we found that the boundaries which separated different martensite variants having large misorientation angles of {001} cleavage planes could inhibit crack propagation. It was then concluded that the size of the aggregations of martensite variants belonging to the same Bain deformation group could control the low-temperature embrittlement of martensitic steels.

引用

页码：3261 / 3268

页数：8

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