Tensile properties and deformation - induced martensitic transformation at cryogenic temperatures in Fe-Cr-Ni-Mn-N alloys

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Advances in Cryogenic Engineering

OSTI ID:476717

Li, D F; Fan, C G; Li, Y Y; Cheng, H M ^[1]

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1. Institute of Metal Research, Shenyang (China)

The tensile properties and changes in microstructures during tensile deformation in Fe-Cr-Ni-Mn-N alloys with a variation of C and N contents have been investigated over the temperature range of 293-4.2 K. It was found that with decreasing temperature the deformation-induced martensitic transformation started at 173 K in the process of {gamma}{r_arrow}{epsilon}{r_arrow}{alpha}{prime}; the amount of {alpha}{prime} martensite formed with maximum uniform strain was greater at 77 K than at 173 or 4.2 K. For the formation of {alpha}{prime} martensite a critical strain was required, and the amount of {alpha}{prime} martensite increased with increasing deformation strain. With the increase in the contents of C and N, the critical strain and the tendency for the increase in the amount of {alpha}{prime} martensite with strain decreased. The results show that both C and N can lead to some increase in the yield and ultimate strengths and a decrease in the elongation, while the deformation-induced martensitic transformation is strongly restrained by the increase in C or N content.

• OSTI ID: 476717
• Report Number(s): CONF-950722--
• Journal Information: Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42A; ISSN 0065-2482; ISSN ACYEAC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
AUSTENITIC STEELS
DEFORMATION
MARTENSITIC STEELS
MICROSTRUCTURE
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TENSILE PROPERTIES