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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0046422
EISBN: 978-1-62708-234-1
... Abstract Stator vanes (cast from a Cu-Mn-Al alloy) in a hydraulic dynamometer used in a steam-turbine test facility were severely eroded. The dynamometer was designed to absorb up to 51 MW (69,000 hp) at 3670 rpm, and constituted an extrapolation of previous design practices and experience. Its...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001086
EISBN: 978-1-62708-214-3
... Abstract Two Z-shape impeller vanes failed. The vane material was 14-hard type 301 stainless steel. The vanes were of two-piece construction, with a longitudinal weld. Analyses indicated that the vanes had not been solution annealed after welding, leaving the heat-affected zone above the welds...
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Published: 01 June 2019
Fig. 3 Showing deposit within vanes. More
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Published: 01 June 2019
Fig. 1 Vanes of a dynamometer stator damaged by liquid erosion. More
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Published: 01 December 1992
Fig. 1 As-received pump impellers. Arrows indicate bent vanes on impeller 3. More
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Published: 01 December 1993
Fig. 2 Diaphragm, showing fracture surface after a vane was removed and two vanes with crack indications More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046966
EISBN: 978-1-62708-229-7
... Abstract A turbine vane made of cast cobalt-base alloy AMS 5382 (Stellite 31; composition: Co-25.5Cr-10.5Ni-7.5W) was returned from service after an undetermined number of service hours because of crack indications on the airfoil sections. This alloy is cast by the precision investment method...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... Abstract The circumstances surrounding the in-service failure of a cast Ni-base superalloy (Alloy 713LC) second stage turbine blade and a cast and coated Co-base superalloy (MAR-M302) first stage air-cooled vane in two turbine engines used for marine application are described. An overview...
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Published: 01 June 2019
Fig. 1 Airfoil segment from a cast Stellite 31 turbine vane that failed by thermal fatigue. (a) and (b) Thermal fatigue cracks emanating from a leading edge and progressing along grain boundaries. The microstructure shows evidence of age hardening by intragranular precipitation of carbide More
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Published: 01 June 2019
Fig. 1 Failure of double fillet welded joint between vane and back plate disclosing lamellar tearing. More
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Published: 01 June 2019
Fig. 4 Detached vane with portion of back plate showing lamellar tearing. More
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Published: 01 June 2019
Fig. 2 Cracked first steps MAR-M302 Turbine engine vane in the as-received condition. (a) Concave airfoil surface; (b) Convex airfoil surface. Metallographic sampling location indicated by arrow M. More
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Published: 01 June 2019
Fig. 12 The cracked turbine vane fracture surface (lightly shaded area is the lab induced overload region). More
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Published: 01 June 2019
Fig. 14 Turbine vane erosion in the leading and the trailing edge areas. (a) Leading edge; (b) Trailing edge. Arrows indicating severe corrosion. More
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Published: 01 June 2019
Fig. 16 Coating features of the vane along the airfoil section. (a) Convex side showing intact coating and shrinkage porosity; (b) Coating-matrix interface along convex side; (c) Vane coating and coating-matrix interface along concave side. More
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Published: 01 June 2019
Fig. 17 Coating degeneration and corrosion attack in MAR-M302 vane along the concave airfoil side. (a) Fine cracking; (b) Subsurface shrinkage porosity; (c) Corrosion product penetration in the subsurface porosity. More
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Published: 01 June 2019
Fig. 18 EDX analysis of the coating and corroded area of MAR-M302 vane. (a) Al and S peaks observed in the coating; (b) Corroded fracture region showing Na, S, Al and Si peaks. More
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Published: 01 June 2019
Fig. 19 Etched microstructural features of the investment cast MAR-M302 vane. (a) Eutectic carbide pools and script-type carbides; (b) Coarse peppery secondary carbide in the background. More
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Published: 01 December 2019
Fig. 1 (a) First-stage vane and (b) inner root area of 700ES More
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Published: 01 December 2019
Fig. 5 ( a ) Photograph of the fractured stator vane on 16th stage. ( b ) SEM showing beach marks More