Influence of deformation on the martensite transformation in SAE 52100 steel

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5368446

Beswick, J M ^[1]

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1. Postbus, Nieuwegein (Netherlands)

In this paper, the effect of prior cold deformation on the martensitic hardening response of SAE 52100 steel is discussed. Cold deformation of soft annealed SAE 52100 lowers the Ac{sub 1} and Ac{sub 3} temperatures from that in deformation-free structures. It results also in lower Ms temperatures with resultant increased retained austenite content and fine prior austenite grain sizes in the hardened condition. This is due to the production of low angle dislocation cells which recover during heating to the austenitizing temperature, first to form fine ferrite subgrains and then a finer austenite grain size, compared to austenitization of deformation-free material. The intersection of the ferrite subgrains with the spheroidal carbide in the soft annealed structures are preferential sites for nucleation of austenite. This results in acceleration of the carbide dissolution and austenite alloy enrichment in the finer grain material. The heat treatment response of typical cold worked products cannot be accurately predicted from published phase transformation data for SAE 52100 steel.

• OSTI ID: 5368446
• Report Number(s): CONF-840909--
• Conference Information: Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
AUSTENITE
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
COLD WORKING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFORMATION
DISLOCATIONS
DISSOLUTION
FABRICATION
FERRITE
GRAIN SIZE
HARDENING
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MARTENSITE
MATERIALS WORKING
MICROSTRUCTURE
NUCLEATION
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SIZE
STEELS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE