On interactions amongst trace and alloying elements at the grain boundaries of a low alloy steel
β Scribed by R.D.K. Misra; T.V. Balasubramanian; P.Rama Rao
- Publisher
- Elsevier Science
- Year
- 1987
- Weight
- 690 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0001-6160
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β¦ Synopsis
Interactions amongst segregants at the grain boundaries of a low alloy steel have been studied using the technique of Auger electron spectroscopy in the temperature range of 75G900 K. Segregation isotherms delineate three kinetically distinct regimes. The first of these is characterized by rapid cosegregation of Cr and N with desegregation of C followed by segregation of V which occurs at relatively higher temperatures. The second stage involves rapid segregation of P which initially attains a maximum coverage and then subsequently decreases with time. The third regime noted at higher temperatures shows slow segregation of S, Sn and Sb. This regime, however, exhibits high sensitivity of site competition to tem~rature.
R6su&Nous
avons etudie les interactions intergranulaires entre elements segreges dans un acier faiblement allit, a l'aide de la technique de la spectroscopic des electrons Auger, dans la gamme des temperatures comprises entre 750 et 9OOK. Les isothermes de segregation delimitent trois regimes cinematiquement distincts. Le premier d'entre eux est caractbrise par une cosegregation rapide de Cr et de N avec desegregation de C, suivie d'une segregation de V qui se produit pour des temperatures relativement plus &levees. Le second stade comprend une segregation rapide de P qui au debut atteint un taux de recouvrement maximal, et qui ensuite decroit avec le temps. Le troisitme regime, observe pour des temperatures plus tlevees, montre une segregation lente de S, Sn et Sb. Ce regime est ntanmoins tres sensible & la competition sur les sites avec la tem~rature. Zusammenfassunp--Die Wechselwirkungen zwischen den segregierenden Stoffen an Korngrenzen wurden an einem niedrig legierten Stahl im Temperaturbereich zwischen 750 und 900 K mittels Augerelektronenspektroskopie untersucht. Segregations-Isothenen ergeben drei kinetisch unterschiedlich ausgezeichnete Bereiche. Der erste ist durch eine rasche Co-Segregation von Cr und N mit einer Desegregation von C gekennrichnet, gefolgt von der Segregation des V bei vergleichsweise hoherer Temperatur. Der zweite Bereich urnfaSt rasche Segregation von P, welcher anfangs eine maximalc Bedeckung erreicht und danach mit der Zeit abWllt. Der dritte Bereich bei hliherer Temperatur weist eine langsame Segregation von S, Sn und Sb auf. In diesem Bereich jedoch beobachtet man eine starke Abh~n~gkeit der Konkurrenz urn Segregationsplat~e von der Tem~ratur.
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