Resilience and ductility of Oxy-fuel HAZ cut
Cutting processes affect the material to a deeper or shallower attached-to-the-cut zone. Its microstructure, its hardness and mechanical properties are changed. Also the cutting process introduces surface roughness and residual stresses. In most cases it is recommended to remove this region by gri...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2014-10-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero30/numero_30_art_3.pdf |
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| Summary: | Cutting processes affect the material to a deeper or shallower attached-to-the-cut zone. Its
microstructure, its hardness and mechanical properties are changed. Also the cutting process introduces surface
roughness and residual stresses. In most cases it is recommended to remove this region by grinding, in order to
keep a smoother surface, free from the above mentioned effects. This work presents the characterization results
of the Heat Affected Zone (HAZ) of a steel plate of grade S460M, with a thickness of 25 mm, cut by flame oxyfuel
gas cutting. The HAZ microstructure is observed (and the depth of the HAZ measured), the hardness
profile and the stress vs. strain curves until fracture are measured by testing micro-tensile samples, instrumented
with strain gauges. Micro-Tensile specimens are 200 microns in thickness and were obtained from layers of the
HAZ at different distances from the oxy-fuel cut. The obtained stress-strain curves are compared with the
hardness measurements and the observed metallography. |
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| ISSN: | 1971-8993 1971-8993 |