Prediction of Charpy impact toughness of steel weld heat-affected zones by combined micromechanics and stochastic fracture model - Part I: Model presentation

被引：17

作者：

Kunigita, Michihiro ^{[1
,4
]}

Aihara, Shuji ^{[2
]}

Kawabata, Tomoya ^{[1
]}

Kasuya, Tadashi ^{[1
]}

Okazaki, Yoshiomi ^{[3
]}

Inomoto, Masahiro ^{[3
]}

机构：

[1] Univ Tokyo, Tokyo, Japan

[2] Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

[3] Kobe Steel Ltd, Kobe, Hyogo, Japan

[4] Sony Corp, Tokyo, Japan

来源：

ENGINEERING FRACTURE MECHANICS | 2020年 / 230卷

关键词：

Impact behavior; Steels; Weld heat-affected zone; Fracture mechanisms; Modeling; GRAIN-BOUNDARY CARBIDE; CLEAVAGE FRACTURE; BRITTLE TRANSITION; STRENGTH; TEMPERATURE; FERRITE; SIZE; MECHANISM; DUCTILE; MICROSTRUCTURES;

D O I：

10.1016/j.engfracmech.2020.106965

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The present paper proposes a new computational model in which the Charpy impact property of steels is predicted from the microstructural information and tensile properties. During cleavage fracture, the Charpy impact property is controlled by the presence of a martensite-austenite constituent (MA) in the predominantly upper bainite microstructure in the weld heat-affected zone and is based on the weakest link mechanism and the micromechanics of the cleavage fracture. The cleavage fracture strength equation has been modified to statistically account for microcrack nucleation and propagation. An example calculation reveals that the proposed model reproduces the Charpy absorbed energy transition curve with a scatter in toughness. The validation of the model with experimental data is presented in the companion paper.

引用

页数：13

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[2]

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[3]

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[4]

Bhadeshia H.K.D.H., 1992, Bainite in Steels

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