Investigation on carburizing duplex-microstructures of martensite-bainite, their properties of 430 D2 steel and the application of carburizing and austempering to self-tapping screw dies

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:389772

Chuenmei, L; Jinhua, X; Xin, C; Suidong, Z; Liming, X ^[1]

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1. Univ. of Science and Engineering, Tianjin (China)

By carburizing, the composition of the case has been greatly changed for 430 D2 steel. The microstructures and properties acquired by the case depends upon the cooling process. This paper deals with comparing the oil quenched structures with the austempered structures of the carburized case. The compared aspects also covered the substructures, relative quantities of several structures, mechanical properties and type of fracture topography. In addition, according to fracture mechanics and the characteristics of fatigue failure of the self-tapping screw dies, how the duplex microstructure of martensite and bainite limited the initiation and propagation of fatigue cracks has been discussed.

• OSTI ID: 389772
• Report Number(s): CONF-951222--; ISBN 0-87170-561-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
AUSTENITE
BENDING
CARBURIZATION
CRACK PROPAGATION
DIES
DISLOCATIONS
FRACTURE PROPERTIES
FRACTURES
HEAT TREATMENTS
MICROHARDNESS
MICROSTRUCTURE
MORPHOLOGY
SCANNING ELECTRON MICROSCOPY
SERVICE LIFE
STEELS
SURFACE TREATMENTS
TEMPERING
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION