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Copper precipitation during continuous cooling and isothermal aging of a710-type steels

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Abstract

Precipitation in copper-containing A710 (also referred to as HSLA-80) and modified-A710 steels was investigated by transmission electron microscopy. Isothermal aging of as-quenched specimens at 675 °C produced e-copper precipitates located primarily at α-iron matrix dislocations. The precipitates exhibited multiple variants of an orientation relationship (OR) consistent with that reported by Kurdjumov and Sachs, fine fault formation, and associated streaking in electron diffraction patterns. For reaustenitized and continuously cooled specimens, the primary precipitation event was associated with interphase precipitation of copper at ferrite/austenite interfaces. Interphase precipitates frequently displayed ORs other than that reported by Kurdjumov and Sachs, although a unique crystallographic variant was observed within any one region of interphase precipitation, faults were observed infrequently, and streaking was not observed in diffraction patterns. At high temperatures during cooling, precipitate-free ferrite formed, whereas at lower temperatures, nucleation of copper precipitates occurred at ferrite/austenite interfaces for crystals of polygonal ferrite and Widmanstätten ferrite. This latter feature precludes the formation of Widmanstätten ferritevia a displacive mechanism. Interphase precipitation was not observed for granular ferrite or acicular ferrite. Less-common precipitation events during continuous cooling included the formation of AIN and CuS.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Colorado School of Mines, Advanced Steel Processing and Products Research Center, 80401, Golden, CO

    S. W. Thompson (Associate Professor/ISS Professor) & G. Krauss (Professor)

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  1. S. W. Thompson
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  2. G. Krauss
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This article is based on a presentation made during TMS/ASM Materials Week in the symposium entitled “Atomistic Mechanisms of Nucleation and Growth in Solids,” organized in honor of H.I. Aaronson’s 70th Anniversary and given October 3–5, 1994, in Rosemont, Illinois.

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Thompson, S.W., Krauss, G. Copper precipitation during continuous cooling and isothermal aging of a710-type steels. Metall Mater Trans A 27, 1573–1588 (1996). https://doi.org/10.1007/BF02649816

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