Damage evolution during fracture by correlative microscopy with hyperspectral electron microscopy and...

Area of Science:

• Materials Science
• Metallurgy
• Fracture Mechanics

Background:

• Understanding metal fracture is crucial for infrastructure integrity.
• Directly observing damage evolution during fracture is experimentally challenging.
• Existing techniques often lack the resolution or accessibility for dense metals.

Purpose of the Study:

• To develop and apply a correlative microscopy framework for studying fracture mechanisms in metals.
• To investigate the role of inclusions in damage nucleation and growth.
• To assess the utility of laboratory X-ray microtomography (XMT) for characterizing microscale damage in steel.

Main Methods:

• Correlative microscopy combining hyperspectral electron microscopy and laboratory X-ray microtomography (XMT).
• Application to a steel inclusion system to analyze fracture.
• Micrometer-scale damage characterization with a large field of view.

Main Results:

• Damage nucleation and growth during fracture were observed to be inhomogeneous and anisotropic.
• Fracture resistance is controlled by inclusion distribution and the size of inclusion-depleted zones.
• Laboratory XMT effectively characterized microscale damage in steel, comparable to synchrotron methods but more accessible.

Conclusions:

• The developed correlative microscopy framework enables detailed study of metal fracture phenomena.
• Inclusion characteristics significantly influence fracture behavior and material reliability.
• Laboratory XMT is a viable and accessible tool for microscale damage assessment in dense metals, facilitating materials research.