Effect of prestrain on stretch-zone formation during ductile fracture of Cu-strengthened high-strength low-alloy steels |
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Authors: | S Sivaprasad S Tarafder V R Ranganath S K Das K K Ray |
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Affiliation: | (1) the National Metallurgical Laboratory, 831007 Jamshedpur, India;(2) the Department of Metallurgical and Materials Engineering, Indian Institute of Technology, 721302 Kharagpur, India |
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Abstract: | The effects of prestrain on the ductile fracture behavior of two varieties of Cu-strengthened high-strength low-alloy (HSLA)
steels have been investigated through stretch-zone geometry measurements. It is noted that the ductile fracture-initiation
toughness of both the steels remained unaltered up to prestrains of ∼2 pct, beyond which the toughness decreased sharply.
A methodology for estimating the stretch-zone dimensions is proposed. Fracture-toughness estimations through stretch-zone
width (SZW) and stretch-zone depth (SZD) measurements revealed that the nature of the variation of ductile fracture toughness
with prestrain can be better predicted through SZD rather than the SZW measurements. However, for the specimen geometries
and prestrain levels that were investigated, none of these methods were found suitable for quantifying the initiation fracture
toughness. |
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