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Related Experiment Video

Updated: Feb 25, 2026

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

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Published on: August 13, 2019

Damage Evolution in Complex-Phase and Dual-Phase Steels during Edge Stretching.

Nikky Pathak¹, Cliff Butcher², Michael James Worswick³

¹Department of Mechanical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada. n3pathak@uwaterloo.ca.

Materials (Basel, Switzerland)

|August 5, 2017

Summary

This summary is machine-generated.

Complex-Phase (CP) and Dual-Phase (DP) steels exhibit different microstructural damage behaviors during edge stretching. CP steels show superior formability due to reduced shear-induced damage compared to DP steels.

Keywords:

damage dual-phase steel ductile failure ferritic-bainitic steel voids

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Area of Science:

Materials Science
Mechanical Engineering
Metallurgy

Background:

Edge stretchability is critical for sheet metal forming.
Microstructural damage significantly influences material formability.
Understanding damage mechanisms in advanced steels like CP and DP is essential.

Purpose of the Study:

To evaluate the role of microstructural damage in controlling the edge stretchability of Complex-Phase (CP) and Dual-Phase (DP) steels.
To compare damage evolution in sheared versus reamed edge conditions.
To develop a model for predicting void evolution and coalescence.

Main Methods:

Hole tension experiments on CP and DP steel specimens.
Microstructural characterization using Scanning Electron Microscopy (SEM) and optical microscopy.
Interruption of tests at various strain levels to analyze damage accumulation.
Development of an analytical model for void evolution.

Main Results:

Martensite cracking and ferrite-martensite decohesion dominate damage in DP780.
TiN particle nucleation and martensite/bainite interface decohesion are key in CP800.
Sheared edges exhibit higher damage rates than reamed edges due to work-hardening and initial damage.
CP steels demonstrate lower susceptibility to shear-induced damage, leading to better formability.

Conclusions:

Microstructure dictates damage mechanisms and evolution in CP and DP steels.
Shearing introduces significant initial damage, impacting edge formability.
CP steels offer superior sheared edge formability compared to DP steels.
The developed analytical model can predict damage rates in diverse microstructures.