## Abstract A literature survey has lead to the conclusion that a theory which postulates an increased anodic reactivity on a local site in the passive film is very probable. Experiments have been set up to confirm these suggestions. By means of the electronβmicroanalyser, it is shown that CI^β^ion
The initiation of ductile failure by fractured carbides in an austenitic stainless steel
β Scribed by J.T Barnby
- Publisher
- Elsevier Science
- Year
- 1967
- Weight
- 864 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0001-6160
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β¦ Synopsis
Fracture of rod-shaped chromium carbide particles in a stainless steel, first observed between 5% and 10% tensile strain, occurs as a result of the concentrated local stresses from matrix slip lines, and a theory describing the condition for fracture of the carbides is in good agreement with the experimental results. Final fracture of the material occurs by the linking-up of the voids formed by the carbide fractures, and consequently the elongation to fracture of the steel is substantially lower than for the same steel without carbide precipitates.
The results for this material suggest that the fracture of brittle fibres in a composite material may also occur as a consequence of the concentrated local stresses from matrix slip lines.
La rupture de baguettes de carbure de chrome dans un a&r inoxydable, d'abord observee pour des deformations de traction comprises entre 5% et, lo%, est le resultat de la concentration locale de contraintes par les lignes de glissement de la matrioe; une thborie dormant la condition de rupture des carbures est en bon accord aveo les r&.ultats expkrimentaux. des carbures entraine finalement la rupture du matbriau;
La jonction des vides form& par la rupture en oon&quence, l'allongement Q la rupture de I'acier est infkrieur, d'une man&e apprAciable, B ce qu'il est pour le mame acier ne contenant pas de pr&ipit& de carbures.
Ces r&ultats suggerent que la concentration locale de contraintes par les lignes de glissement de la matrice peut aussi i?tre It l'origine de la rupture de fibres fragile8 dan un mat&au composk. DIE EINLEITUNG EINES DUKTILEN REISSENS DURCH BRUCHKARBIDE IN EINEM AUSTENITISCHEN ROSTFREIEN STAHL Der Bruch stabfijrmiger Chromkarbidt,eilchen in einem rostfreien Stahl, der zwischen 5% und 10% Zugspannung erstmals auftritt, erscheint als die Folge konzentrierter lokaler Spannungen van Matrixgleitlinien. Eine Theorie zur Beschreibung der Bedingungen fiir den Bruch der Karbide ist in guter ubereinstimmung mit den experimentellen Resultaten. Der Bruch des Materials erfolgt schliedlich durch die Verbindung der durch den Karbidbruch entstandenen Hohlr&ume. Folglich ist die Bruchdehnung dieses Stahles wesentlich kleiner ah diejenige eines Stahles ohne Karbidausscheidungen. Die Ergebnisse an diesem Material lassen vermuten, daD der Bruch sprGder Fasern in einem zusammengesetzten Material such durch konzentrierte lokale Spannungen durch Matrixgleitlinien erfolgen kann.
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