Design of tough ferritic steels for cryogenic use

Conference · Tue Oct 01 00:00:00 EDT 1985

OSTI ID:5833148

Morris, Jr, J W

This paper describes the design of ferritic steels and weldments that combine strength and toughness at cryogenic temperatures. The alloy must have a ductile-brittle transition temperature below the intended service temperature and a high fracture toughness in the ductile mode. Its systematic design uses the microstructure-property relations that govern the transition temperature and fracture toughness to identify a suitable microstructure, and then employs the microstructure-processing relations that govern its thermal response to manipulate the microstructure into the appropriate form. The procedure is illustrated by describing the heat treatments, microstructures and properties of a variety of laboratory and commercial alloys, including conventional ''9Ni'' steel, the low-Ni and Fe-Mn ferritic steels that have been developed as an alternative to 9Ni, the 12Ni steels that are promising for use at 4K, and the welding procedures and ferritic filler metals that are useful for ferritic cryogenic steels.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5833148
• Report Number(s): LBL-20485; CONF-8603110-1; ON: DE86009361
• Resource Relation: Conference: Symposium on structure/property relationships, New Orleans, LA, USA, 3 Mar 1986; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FERRITIC STEELS
OPTIMIZATION
NICKEL STEELS
DUCTILE-BRITTLE TRANSITIONS
HEAT TREATMENTS
MICROSTRUCTURE
TRANSMISSION ELECTRON MICROSCOPY
ULTRALOW TEMPERATURE
WELDED JOINTS
WELDING
ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MICROSCOPY
NICKEL ALLOYS
STEELS
360100* - Metals & Alloys