Hot-cracking studies of alloy CN-7M

Journal Article · Wed May 01 04:00:00 EDT 1985 · Weld. J. (Miami); (United States)

OSTI ID:5089480

Cieslak, M J; Savage, W F

An investigation was performed to determine the causes of hotcracking in cast alloy CN-7M. Differential thermal analysis results indicated that CN7M does not have an extremely wide solidification temperature range. Varestraint hot-cracking tests were performed on two sets of factorial-designed alloys. Results of these tests indicate that sulfur, phosphorus, and silicon are responsible for the hot-cracking tendency of alloy CN-7M. The mechanism of cracking was found to be related to the segregation of impurity elements to solidification grain boundaries. Silicon additions caused a thin film M/sub 6/C carbide/austenite eutectic to form which severely reduced the resistance to hot-cracking of alloy CN-7M. Solidification quench experiments were performed to determine the segregation pattern of solute elements during solidification. All elements analyzed (Ni, Cr, Cu, Mo, Mn, Si, S, P) were found to segregate to interdendritic volumes during solidification.

• Research Organization: Sandia National Lab., Albuquerque, NM
• OSTI ID: 5089480
• Journal Information: Weld. J. (Miami); (United States), Journal Name: Weld. J. (Miami); (United States) Vol. 64:5; ISSN WEJUA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
COPPER ALLOYS
CRACK PROPAGATION
DESTRUCTIVE TESTING
DIFFERENTIAL THERMAL ANALYSIS
FRACTURE PROPERTIES
IMPURITIES
MANGANESE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PHASE TRANSFORMATIONS
PHOSPHORUS COMPOUNDS
SILICON ALLOYS
SOLIDIFICATION
STRESSES
SULFUR COMPOUNDS
TEMPERATURE EFFECTS
TESTING
THERMAL ANALYSIS
THERMAL CYCLING
THERMAL STRESSES