Assessment of Formability of Hot-Rolled Steel through Determination of Hole-Expansion Ratio

De, Saikat K.; Deva, Anjana; Mukhopadhyay, Siddhartha; Jha, B. K.

doi:10.1080/10426914.2010.531240

Materials and Manufacturing Processes

2011

DOI: 10.1080/10426914.2010.531240

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Assessment of Formability of Hot-Rolled Steel through Determination of Hole-Expansion Ratio

Saikat K. De¹,

Anjana Deva²,

Siddhartha Mukhopadhyay³

et al.

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Cited by 8 publications

References 9 publications

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Effect of Interphase Hardness and Elastic Modulus on Fracture Behavior during Hole Expansion Testing of Hot‐Rolled Steels with Low‐Temperature Transformation Microstructures

Lee

et al. 2017

steel research int.

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This study investigates the fracture behavior during hole expansion testing of a 980 MPa hot‐rolled Fe–Cr–Ti–B steel, with particular focus on analyzing the microvoid initiation and crack propagation during plastic deformation. The microstructure of the steel consists of a tempered martensite matrix and granular bainite, with each constituent phase being identified by field emission scanning electron microscopy, transmission electron microscopy, micro Vickers hardness, and nanoindentation. Microvoids are observed at the intergranular boundaries, transgranular regions, and at the interface of precipitates/matrix and non‐metallic inclusions/matrix. The main crack is generated at the intergranular interface between the tempered martensite and granular bainite, an area exhibiting a large deviation in hardness and elastic modulus. The tempered martensite has a greater hardness of 385 Hv and elastic modulus of 287 GPa, as opposed to the 326 Hv and 257 GPa of the granular bainite. Due to this difference in elastic modulus, the granular bainite plastically deforms at a lower applied stress than the tempered martensite. The main crack obtained from the hole expansion test generates a fractography mixed with dimple and quasi‐cleavage fracture pattern. Therefore, the crack initiated at the interface of the tempered martensite and granular bainite is propagated along the transgranular regions.

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Effect of Interphase Hardness and Elastic Modulus on Fracture Behavior during Hole Expansion Testing of Hot‐Rolled Steels with Low‐Temperature Transformation Microstructures

Lee

et al. 2017

steel research int.

View full text Add to dashboard Cite

show abstract

Development of Stretch Flangeable Grade Steels by Inclusion Engineering Approach

Mandal

Ashok

Das

et al. 2018

J. of Materi Eng and Perform

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Formability behaviour of ferritic and austenitic rolled Nb–Ti stabilized IF grade steel

2023

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Assessment of Formability of Hot-Rolled Steel through Determination of Hole-Expansion Ratio

Cited by 8 publications

References 9 publications

Effect of Interphase Hardness and Elastic Modulus on Fracture Behavior during Hole Expansion Testing of Hot‐Rolled Steels with Low‐Temperature Transformation Microstructures

Effect of Interphase Hardness and Elastic Modulus on Fracture Behavior during Hole Expansion Testing of Hot‐Rolled Steels with Low‐Temperature Transformation Microstructures

Development of Stretch Flangeable Grade Steels by Inclusion Engineering Approach

Formability behaviour of ferritic and austenitic rolled Nb–Ti stabilized IF grade steel

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