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CRITICAL COOLING RATE [4 records]

Record 1 2016-02-25

English

Subject field(s)
  • Metal Quenching
  • Steel
DEF

The incomplete hardening of steel due to quenching from the austenitizing temperature at a rate slower than the critical cooling rate for the particular steel, resulting in the formation of one or more transformation products in addition to martensite.

CONT

Although [austenitic manganese steels] are brittle in their as-cast condition, their high toughness is obtained after a solution annealing and quenching heat treatment. Even with these improvements, thick sections and slack quenching can result in materials with inadequate properties that lead to expensive failures in the field.

French

Domaine(s)
  • Trempe (Métal)
  • Acier
CONT

[Les aciers austénitiques au manganèse] sont fragiles dans leur état brut de coulée, mais leur ténacité peut être grandement accrue en les soumettant à un traitement thermique de recuit de solution et de trempe. Toutefois, malgré ces améliorations, un profil renforcé et une trempe incomplète peuvent conférer au matériau des propriétés inadéquates.

Spanish

Save record 1

Record 2 2004-12-17

English

Subject field(s)
  • Process Annealing of Metals
  • Prosthetic Dentistry
DEF

The process of reheating hardened steel to some temperature below the lower critical temperature, followed by one desired rate of cooling.

OBS

Tempering, also known as drawing.

French

Domaine(s)
  • Revenu (Métal)
  • Dentisterie prothétique
DEF

Dans le cas des aciers ou des fontes durcis par trempe, le traitement consiste en un réchauffage à une certaine température inférieure à la température eutectoïde, dans le but de diminuer la dureté et d'augmenter la ténacité. Ce traitement est quelquefois appliqué aux aciers normalisés.

CONT

[...] dans le cas des aciers trempés, il [le revenu] consiste en un réchauffage lent au-dessous de la température du début de la transformation à l'échauffement (soit 700° environ).

Spanish

Save record 2

Record 3 1999-11-10

English

Subject field(s)
  • Metal Quenching
DEF

The minimum rate of continuous cooling for preventing undesirable transformations. For steel, unless otherwise specified, it is the slowest rate at which austenite can be cooled from above critical temperature to prevent its transformation above the martensite start temperature.

French

Domaine(s)
  • Trempe (Métal)

Spanish

Save record 3

Record 4 1997-05-21

English

Subject field(s)
  • Metallurgy - General
DEF

A previously unresolvable, rapidly etching, fine aggregate of carbide and ferrite produced either by tempering martensite at low temperature or by quenching a steel at a rate slower than the critical cooling rate.

French

Domaine(s)
  • Métallurgie générale
DEF

Agrégat de ferrite et de cémentite non résoluble au microscope optique, apparaissant sous la forme d'îlots aux contours arrondis (encore quelquefois appelé «troostite»).

Spanish

Save record 4

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