Determination of the critical parameters for the onset of dynamic recrystallization (DRX) in advanced ultra-high strength steels (A-UHSS) microalloyed with boron

• Autorzy: Guerrero G. A. , Granados I. M. , Marrero J. M. C.

Warianty tytułu

PL

Wyznaczanie krytycznych parametrów dla rozpoczęcia rekrystalizacji dynamicznej (DRX) i zaawansowanych stalach o podwyższonej wytrzymałości z dodatkiem boru

• Języki publikacji: EN

Abstrakty

EN

In this research work, the double differentiation mathematical method was used to identify more accurately the critical stress (σc) and critical strain (εc) associated with the onset of dynamic recrystallization (DRX), which is based on changes of the strain hardening rate (θ=δσ/δε) as a function of the flow stress (Poliak and Jonas method, simplified by Najafizadeh and Jonas). For this purpose, a low carbon advanced ultra-high strength steel (A-UHSS) microalloyed with different amounts of boron (0, 14, 33, 82, 126 and 214 ppm) was deformed by uniaxial hot-compression tests at high temperatures (950, 1000, 1050 and 1100°C) and constant true strain rates (10-3, 10-2 and 10-1s-1). Results indicate that both σc and εc increase with decreasing deformation temperature and increasing strain rate. On the other hand, these critical parameters tend to decrease as boron content increases. Such a behavior is attributed to a solute drag effect by boron atoms on the austenitic grain boundaries and also to a solid solution softening effect.

PL

Matematyczna metoda podwójnego różniczkowania została zastosowana dla dokładniejszej identyfikacji krytycznego naprężenia σc i krytycznego odkształcenia εc. związanego z rozpoczęciem rekrystalizacji dynamicznej (DRX). Te dwa parametry są związane z prędkością umocnienia θ=δσ/δε przedstawianą jako funkcja naprężenia uplastyczniającego (metoda Poliaka i Jonasa, uproszczona przez Najafizadeha i Jonasa). W tym celu niskowęglową stal o wysokiej wytrzymałości (ang. advanced ultra-high strength steel -AUHSS) wzbogacono różnymi zawartościami boru (0, 14, 33, 82, 126 i 214 ppm). Tą stal poddano odkształceniom plastycznym w wysokich temperaturach (950, 1000, 1050 i 1100°C przy stałych prędkościach odkształcenia (10-3, 10-2 and 10-1s-1). Otrzymane wyniki wykazały, że zarówno σc jak i εc rośnie wraz z obniżeniem się temperatury odkształcenia i wzrostem prędkości odkształcenia. Z drugiej strony, te krytyczne parametry zmniejszają się gdy wzrasta zawartość boru w stali. Jako przyczynę takiego zachowania uznano wpływ atomów boru w roztworze na granice ziaren austenitu a także wpływ mięknięcia roztworowego.

Słowa kluczowe

EN

advanced ultra-high strength steels; hot deformation; dynamic recrystallization; critical stress; critical strain; strain hardening rate

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2012
• Tom: Vol. 12, No. 3
• Strony: 152--162
• Opis fizyczny: Bibliogr. 48 poz., rys.

Twórcy

autor

Guerrero G. A.

• Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, Edificio "U", Ciudad Universitaria, 58066 - Morelia, Michoacán, México

autor

Granados I. M.

• Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, Edificio "U", Ciudad Universitaria, 58066 - Morelia, Michoacán, México

autor

Marrero J. M. C.

• Departament de Ciencia deis Materials i Enginyeria Metallúrgica, ETSEIB - Universität Politécnica de Catalunya, Av. Diagonal 647, 08028 - Barcelona, Spain
• Fundado CTM Centre Tecnológic, Av. de las Bases de Manresa, 1, 08240 — Manresa, Spain

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