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Effect of decreased hot-rolling reduction treatment on fracture toughness of low-alloy structural steels

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Abstract

Commercial low-alloy structural steels, 0.45 pct C (AISI 1045 grade), 0.40 pct C-Cr-Mo (AISI 4140 grade), and 0.40 pct C-Ni-Cr-Mo (AISI 4340 grade), have been studied to determine the effect of the decreased hot-rolling reduction treatment (DHRRT) from 98 to 80 pct on fracture toughness of quenched and highly tempered low-alloy structural steels. The significant conclusions are as follows: (1) the sulfide inclusions were modified through the DHRRT from a stringer (mean aspect ratio: 16.5 to 17.6) to an ellipse (mean aspect ratio: 3.8 to 4.5), independent of the steels studied; (2) the DHRRT significantly improvedJ Ic in the long-transverse and shorttransverse orientations, independent of the steels studied; and (3) the shelf energy in the Charpy V-notch impact test is also greatly improved by the DHRRT, independent of testing orientation and steels studied; however, (4) the ductile-to-brittle transition temperature was only slightly affected by the DHRRT. The beneficial effect on theJ Ic is briefly discussed in terms of a crack extension model involving the formation of voids at the inclusion sites and their growth and eventual linking up through the rupture of the intervening ligaments by local shear.

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  1. Department of Metallurgical Engineering, College of Engineering, University of Osaka Prefecture, Sakai, 591, Osaka, Japan

    Yoshiyuki Tomita (Associate Professor)

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  1. Yoshiyuki Tomita
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Tomita, Y. Effect of decreased hot-rolling reduction treatment on fracture toughness of low-alloy structural steels. Metall Trans A 21, 2555–2563 (1990). https://doi.org/10.1007/BF02647001

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