Fracture mechanism and model of 18Ni maraging steel

Hongge Fu; Lijing Xie; Xibin Wang; Xin Hu; Feinong Gao

doi:10.1080/02670836.2020.1744835

Fracture mechanism and model of 18Ni maraging steel

Hongge Fu, Lijing Xie^*, Xibin Wang, Xin Hu, Feinong Gao

^*Corresponding author for this work

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

18Ni maraging steel is normally used to make key components by machining processes. It is necessary to understand the fracture mechanism and behaviour of 18Ni maraging steel for the study and further optimisation of machining processes. In this paper, the Split Hopkinson Tensile Bar tests accompanied by quasi-static mechanical tests are carried out to relate the stress triaxiality, deformation temperature and strain rate with the fracture strain. During the building up of the fracture model, it is noticed that the change of fracture mechanism from 600°C to 900°C brings about a non-linear relationship of fracture strain with the deformation temperature. This results in a large error in fitting the Johnson–Cook (J-C) fracture model, so a modified fracture model is put forward.

Original language	English
Pages (from-to)	894-898
Number of pages	5
Journal	Materials Science and Technology
Volume	36
Issue number	7
DOIs	https://doi.org/10.1080/02670836.2020.1744835
Publication status	Published - 2 May 2020

Keywords

18Ni maraging steel
fracture mechanism
fracture model
non-linear relationship

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10.1080/02670836.2020.1744835

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title = "Fracture mechanism and model of 18Ni maraging steel",

abstract = "18Ni maraging steel is normally used to make key components by machining processes. It is necessary to understand the fracture mechanism and behaviour of 18Ni maraging steel for the study and further optimisation of machining processes. In this paper, the Split Hopkinson Tensile Bar tests accompanied by quasi-static mechanical tests are carried out to relate the stress triaxiality, deformation temperature and strain rate with the fracture strain. During the building up of the fracture model, it is noticed that the change of fracture mechanism from 600°C to 900°C brings about a non-linear relationship of fracture strain with the deformation temperature. This results in a large error in fitting the Johnson–Cook (J-C) fracture model, so a modified fracture model is put forward.",

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AU - Fu, Hongge

AU - Xie, Lijing

AU - Wang, Xibin

AU - Hu, Xin

AU - Gao, Feinong

PY - 2020/5/2

Y1 - 2020/5/2

N2 - 18Ni maraging steel is normally used to make key components by machining processes. It is necessary to understand the fracture mechanism and behaviour of 18Ni maraging steel for the study and further optimisation of machining processes. In this paper, the Split Hopkinson Tensile Bar tests accompanied by quasi-static mechanical tests are carried out to relate the stress triaxiality, deformation temperature and strain rate with the fracture strain. During the building up of the fracture model, it is noticed that the change of fracture mechanism from 600°C to 900°C brings about a non-linear relationship of fracture strain with the deformation temperature. This results in a large error in fitting the Johnson–Cook (J-C) fracture model, so a modified fracture model is put forward.

AB - 18Ni maraging steel is normally used to make key components by machining processes. It is necessary to understand the fracture mechanism and behaviour of 18Ni maraging steel for the study and further optimisation of machining processes. In this paper, the Split Hopkinson Tensile Bar tests accompanied by quasi-static mechanical tests are carried out to relate the stress triaxiality, deformation temperature and strain rate with the fracture strain. During the building up of the fracture model, it is noticed that the change of fracture mechanism from 600°C to 900°C brings about a non-linear relationship of fracture strain with the deformation temperature. This results in a large error in fitting the Johnson–Cook (J-C) fracture model, so a modified fracture model is put forward.

KW - 18Ni maraging steel

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KW - fracture model

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Fracture mechanism and model of 18Ni maraging steel

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