DS CM 247 LC - enhanced mechanical properties response through optimized solutioning technique
- Cannon-Muskegon Corporation, Muskegon, MI (USA)
CM 247 LC is a Ni-base superalloy, derived from Mar M 247, developed for application in gas turbine directionally solidified (DS) blade vane castings. It exhibits exceptional resistance to grain boundary cracking and provides an improved carbide microstructure, relative to DS Mar M 247. DS CM 247 LC also possesses an increased incipient melting point. Whereas DS Mar M 247 LC is normally restricted to 1221 C solution temperature, DS CM 247 LC may be solutioned as high as 1260 C, resulting in complete solutioning of the as-cast, coarse {gamma}{prime} along with considerable eutectic {gamma} - {gamma}{prime} solutioning, without incipient melting. The resultant increase in fine {gamma}{prime} volume fraction effects significantly improved mechanical properties. The results of extensive solutioning cycle investigations are presented metallographically, with respective correlation to strength capability. Additionally, product from three differing thermal gradient DS casting processes is examined, with the respective microstructures characterized in relation to mechanical property capability and effects upon incipient melting point. Alloy stability characteristics of the high temperature solutioned specimens are also reviewed.
- OSTI ID:
- 5366665
- Report Number(s):
- CONF-840909--
- Journal Information:
- TMS (The Metallurgical Society) Paper Selection; (USA), Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Vol. 56; ISSN TMPSA; ISSN 0197-1689
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CASTINGS
CRACKS
CRYSTAL STRUCTURE
FRACTURE PROPERTIES
GAS TURBINES
GRAIN BOUNDARIES
MACHINERY
MECHANICAL PROPERTIES
MELTING POINTS
METALLOGRAPHY
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SOLIDIFICATION
STABILITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TURBINE BLADES
TURBINES
TURBOMACHINERY