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The tensile properties of metastable chromium manganese steel are influenced by the deformation induced martensitic transformation. While beneficial in increasing the strain hardening rate and ultimate tensile strength, the presence of substantial amounts of martensite can lead to a brittle, transgranular fracture mode. The effect of prior thermomechanical processing on transformation and plastic deformation in a 10Cr18Mn steel has been investigated by two different approaches: (i) low temperature deformation and subsequent heat treatment; (ii) high temperature deformation alone. The influence of these treatments on stress-strain behaviour and fracture is discussed. Transformation kinetics are studied by means of X-ray diffraction and magnetic measurements. Microstructural observations show that dislocation substructures introduced by prior deformation inhibit transformation by acting as barriers to the growth of martensite platelets. The resultant decrease in the volume fraction of martensite leads to an increase in ductility and the appearance of a region of non-uniform elongation before failure.

Additional information

Authors: RICKERBY D G, JRC Ispra (IT);PIATTI G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Microstructure and Mechanical Processing, Cambridge (GB), March 28-30, 1990
Availability: Available from (1) as Paper EN 35510 ORA
Record Number: 199011239 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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