Backscattered electron microscopy technique enhancing stretch zone width imaging for initiation fracture toughness measurements

The stretch zone width (SZW) data for 15-5PH steel CTOD specimens fractured at -150°C to + 23°C temperature were measured based on focused images and 3D maps obtained by extended depth-of-field reconstruction from light microscopy (LM) image stacks. This LM-based method, with a larger lateral resolution, seems to be as effective for quantitative analysis of SZW as scanning electron microscopy (SEM) or confocal scanning laser microscopy (CSLM), permitting to clearly identify stretch zone boundaries. Despite the worst sharpness of focused images, a robust linear correlation was established to fracture toughness (K(C) ) and SZW data for the 15-5PH steel tested specimens, measured at their center region. The method is an alternative to evaluate the boundaries of stretched zones, at a lower cost of implementation and training, since topographic data from elevation maps can be associated with reconstructed image, which summarizes the original contrast and brightness information. Finally, the extended depth-of-field method is presented here as a valuable tool for failure analysis, as a cheaper alternative to investigate rough surfaces or fracture, compared to scanning electron or confocal light microscopes.

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MRT letter: Extended depth from focus reconstruction method for stretch zone measurement in 15‐5PH steel

Caltabiano

Rosa

Campos

et al. 2012

Microscopy Res & Technique

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The stretch zone of automotive steel sheets

Ambriško

Pešek

2014

Sadhana

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The paper deals with an experimental determination of the stretch zone dimensions in the notch tip in thin steel sheets. The stretch zone dimensions depend on steel grade, on the rolling direction as well as on the loading rate. Stretch zones were observed and measured on three steel grades. Fracture area and stretch zones were analysed by SEM. Stable crack growth was monitored by videoextensometry techniques on CT (Compact Tension) specimens. Specimens were loaded under two loading rates by eccentric tension, whereby the deformation in the notch surrounding area was recorded using a non-contact measurement-videoextensometry technique. Linear relation between the stretch zone dimensions was determined.

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Evaluating the Geometric Variation of Critical SZW in Mod9Cr1Mo Steel

Saxena

Sasikala

Dutta

2017

Trans Indian Inst Met

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Backscattered electron microscopy technique enhancing stretch zone width imaging for initiation fracture toughness measurements

Cited by 7 publications

References 15 publications

MRT letter: Extended depth from focus reconstruction method for stretch zone measurement in 15‐5PH steel

MRT letter: Extended depth from focus reconstruction method for stretch zone measurement in 15‐5PH steel

The stretch zone of automotive steel sheets

Evaluating the Geometric Variation of Critical SZW in Mod9Cr1Mo Steel

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