Published June 1987 | Version v1
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Effect of heat and mechanical treatments on the microstructure of type Z6 CNDT 17.13 phosphorus containing, titanium stabilized austenitic stainless steels

Creators

Description

The heterogeneities in composition resulting from hot transformation are eliminated by high temperature heat treatments. Phosphorus additions to this type of stainless steel does not affect significantly the homogeneity in composition. A significant lowering of the recrystallisaton temperature results from cold working. In addition, the precipitation of minute titanium crystals is promoted as well as that of phosphorus at temperatures between 500 and 600oC. At concentrations in excess of 0.1 %, phosphorus precipitation induces a significant change in the crystal lattice. At high concentrations, phosphorus precipitates upon show heating or cooling (rate below 100 deg C/min) requiring a high temperature heat treatment to revert to solution (above 1000 deg C). This type of steel is chosen for fuel cans of LMFBR reactors

Abstract (French)

Les heterogeneites de composition observees apres les transformations a chaud sont eliminees par traitements thermiques a haute temperature. L'addition de phosphore a ce type de nuance n'apporte pas de modification notable sur l'homogeneite de la composition. L'ecrouissage provoque une diminution sensible de la temperature de recristallisation. De plus, il favorise la precipitation de fins carbures de titane, mais aussi celle du phosphore a basse temperature entre 500 et 600 deg C. Cette precipitation de phosphore conduit a une modification importante du parametre cristallin pour des teneurs superieures a 0,1 %. Pour les fortes teneurs en phosphore, on note une precipitation du phosphore au cours du chauffage ou du refroidissement lent (inferieurs a 100 deg C/min.). Il ne repasse en solution qu'au cours de traitement thermique a haute temperature (au-dela de 1000 deg C). Ce type d'acier a ete choisi pour le gainage du combustible des reacteurs rapides refroidis au sodium

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Additional details

Additional titles

Original title (French)
Influence des traitements thermiques et mecaniques sur la microstructure des aciers austenitiques inoxydables stabilises au titane, du type Z6 CNDT 17.13, dopes au phosphore

Publishing Information

Imprint Pagination
67 p.
Report number
CEA-R--5415

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
19057893
Subject category
S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
HARDNESS; HEAT TREATMENTS; HIGH TEMPERATURE; LATTICE PARAMETERS; MICROSTRUCTURE; PHOSPHORUS ADDITIONS; PRECIPITATION; RECRYSTALLIZATION; STEEL-CR17NI13MO3TI; STRAIN HARDENING; VERY HIGH TEMPERATURE
Descriptors DEC
ALLOYS; AUSTENITIC STEELS; CARBON ADDITIONS; CHROMIUM ALLOYS; CHROMIUM-NICKEL STEELS; CHROMIUM-NICKEL-MOLYBDENUM STE; CORROSION RESISTANT ALLOYS; CRYSTAL STRUCTURE; HARDENING; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; MOLYBDENUM ALLOYS; NICKEL ALLOYS; SEPARATION PROCESSES; STAINLESS STEELS; STEELS; TITANIUM ADDITIONS