Varied sub-grain microstructure impacts fracture behavior and resistance in 316LN weld metal

被引：5

作者：

Dai Keshun ^{[1
]}

Zhu Li ^{[1
]}

Xiao Wenkai ^{[1
]}

Chen Fangyu ^{[2
]}

Zhang Fuju ^{[1
]}

Yang Xue ^{[1
]}

Mudi Kunqi ^{[1
]}

Zhai Xian ^{[1
]}

Zhang Mingxiang ^{[1
]}

机构：

[1] Wuhan Univ, Coll Power & Mech Engn, Wuhan, Hubei, Peoples R China

[2] Daye Special Steel CO LTD, Huangshi, Hubei, Peoples R China

来源：

ENGINEERING FRACTURE MECHANICS | 2017年 / 176卷

关键词：

Sub-grain; CFEM; Fracture resistance; Sub-grain boundary; 316LN weld metal; FINITE-ELEMENT-METHOD; POLYCRYSTALLINE BRITTLE MATERIALS; FAILURE INITIATION; CERAMIC COMPOSITES; LEVEL MODEL; STEEL; TOUGHNESS; PREDICTION; DAMAGE; EVOLUTION;

D O I：

10.1016/j.engfracmech.2017.02.025

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Sub-grain microstructure generally exists in the 316LN weld metal (WM) and the sub-grain size and morphology as well as its orientation vary. In order to analyze the effect of 316LN cast microstructure characteristics on its fracture behavior, a numerical model based on cohesive finite element method (CFEM) was presented. Based on experimental microstructure images, three kinds of morphological microstructures were numerically modeled with quantified parameters. The simulated result predicted the experimental fracture behaviors well, which validated the effectiveness of the CFEM model. Two fracture modes were summarized and the fracture resistance values of different microstructures were compared and analyzed quantitatively. Sub-grain boundaries in the weld metal showed inhibition effects on crack propagation. However, a high volume fraction of sub-grain boundaries made the fracture resistance decline. Columnar and dendritic microstructures showed anisotropic fracture resistance and the overlong secondary dendritic arms made the toughness worse. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：100 / 115

页数：16

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