Evaluation of near surface defects and fatigue properties of cast iron

Jouni Alhainen, Jussi Solin, Matti Johansson

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

1 Citation (Scopus)

Abstract

This research work aimed to find out means to ensure fatigue strength of cast components. Componenta carries out R&D to avoid casting defects which have detrimental effect on the fatigue properties. Extensive metallographic studies and fatigue experiments were herein performed to support this development work. Clear differences in the amount of degenerated graphite and defects near the casting surface were seen in the micrographs at different surface positions. An ultrasound scanning microscope was used to evaluate applicability of Rayleigh wave velocity measurements to detect and classify small surface defects. This technology was investigated as a candidate method for non-destructive quality control. Some fatigue crack initiation sites could be correlated with the detected surface defects, but the influence of defects on the fatigue properties could not be evaluated. The fatigue strengths of the studied variants were within a common scatter band. But the results of ultrasonic measurements are in perfect agreement with the microstructural measurements. They are also fully in line with the trends in fatigue lives and scatters.
Original languageEnglish
Title of host publicationCompetent Design by Castings: Improvements in a Nordic project
Subtitle of host publicationGJUTDESIGN-2005 final seminar
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages133-155
ISBN (Electronic)951-38-6299-2
ISBN (Print)951-38-6298-4
Publication statusPublished - 2005
MoE publication typeB3 Non-refereed article in conference proceedings
EventCompetent Design by Castings: Improvements in a Nordic project
: GJUTDESIGN-2005 final seminar
- Espoo, Finland
Duration: 13 Jun 200514 Jun 2005

Publication series

SeriesVTT Symposium
Number237
ISSN0357-9387

Seminar

SeminarCompetent Design by Castings: Improvements in a Nordic project
CountryFinland
CityEspoo
Period13/06/0514/06/05

Fingerprint

Surface defects
Cast iron
Fatigue of materials
Defects
Casting
Ultrasonic measurement
Rayleigh waves
Crack initiation
Velocity measurement
Quality control
Graphite
Microscopes
Ultrasonics
Scanning
Experiments
Fatigue strength

Cite this

Alhainen, J., Solin, J., & Johansson, M. (2005). Evaluation of near surface defects and fatigue properties of cast iron. In Competent Design by Castings: Improvements in a Nordic project: GJUTDESIGN-2005 final seminar (pp. 133-155). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 237
Alhainen, Jouni ; Solin, Jussi ; Johansson, Matti. / Evaluation of near surface defects and fatigue properties of cast iron. Competent Design by Castings: Improvements in a Nordic project: GJUTDESIGN-2005 final seminar. Espoo : VTT Technical Research Centre of Finland, 2005. pp. 133-155 (VTT Symposium; No. 237).
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title = "Evaluation of near surface defects and fatigue properties of cast iron",
abstract = "This research work aimed to find out means to ensure fatigue strength of cast components. Componenta carries out R&D to avoid casting defects which have detrimental effect on the fatigue properties. Extensive metallographic studies and fatigue experiments were herein performed to support this development work. Clear differences in the amount of degenerated graphite and defects near the casting surface were seen in the micrographs at different surface positions. An ultrasound scanning microscope was used to evaluate applicability of Rayleigh wave velocity measurements to detect and classify small surface defects. This technology was investigated as a candidate method for non-destructive quality control. Some fatigue crack initiation sites could be correlated with the detected surface defects, but the influence of defects on the fatigue properties could not be evaluated. The fatigue strengths of the studied variants were within a common scatter band. But the results of ultrasonic measurements are in perfect agreement with the microstructural measurements. They are also fully in line with the trends in fatigue lives and scatters.",
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Alhainen, J, Solin, J & Johansson, M 2005, Evaluation of near surface defects and fatigue properties of cast iron. in Competent Design by Castings: Improvements in a Nordic project: GJUTDESIGN-2005 final seminar. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 237, pp. 133-155, Competent Design by Castings: Improvements in a Nordic project
, Espoo, Finland, 13/06/05.

Evaluation of near surface defects and fatigue properties of cast iron. / Alhainen, Jouni; Solin, Jussi; Johansson, Matti.

Competent Design by Castings: Improvements in a Nordic project: GJUTDESIGN-2005 final seminar. Espoo : VTT Technical Research Centre of Finland, 2005. p. 133-155 (VTT Symposium; No. 237).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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T1 - Evaluation of near surface defects and fatigue properties of cast iron

AU - Alhainen, Jouni

AU - Solin, Jussi

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N2 - This research work aimed to find out means to ensure fatigue strength of cast components. Componenta carries out R&D to avoid casting defects which have detrimental effect on the fatigue properties. Extensive metallographic studies and fatigue experiments were herein performed to support this development work. Clear differences in the amount of degenerated graphite and defects near the casting surface were seen in the micrographs at different surface positions. An ultrasound scanning microscope was used to evaluate applicability of Rayleigh wave velocity measurements to detect and classify small surface defects. This technology was investigated as a candidate method for non-destructive quality control. Some fatigue crack initiation sites could be correlated with the detected surface defects, but the influence of defects on the fatigue properties could not be evaluated. The fatigue strengths of the studied variants were within a common scatter band. But the results of ultrasonic measurements are in perfect agreement with the microstructural measurements. They are also fully in line with the trends in fatigue lives and scatters.

AB - This research work aimed to find out means to ensure fatigue strength of cast components. Componenta carries out R&D to avoid casting defects which have detrimental effect on the fatigue properties. Extensive metallographic studies and fatigue experiments were herein performed to support this development work. Clear differences in the amount of degenerated graphite and defects near the casting surface were seen in the micrographs at different surface positions. An ultrasound scanning microscope was used to evaluate applicability of Rayleigh wave velocity measurements to detect and classify small surface defects. This technology was investigated as a candidate method for non-destructive quality control. Some fatigue crack initiation sites could be correlated with the detected surface defects, but the influence of defects on the fatigue properties could not be evaluated. The fatigue strengths of the studied variants were within a common scatter band. But the results of ultrasonic measurements are in perfect agreement with the microstructural measurements. They are also fully in line with the trends in fatigue lives and scatters.

M3 - Conference article in proceedings

SN - 951-38-6298-4

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BT - Competent Design by Castings: Improvements in a Nordic project

PB - VTT Technical Research Centre of Finland

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Alhainen J, Solin J, Johansson M. Evaluation of near surface defects and fatigue properties of cast iron. In Competent Design by Castings: Improvements in a Nordic project: GJUTDESIGN-2005 final seminar. Espoo: VTT Technical Research Centre of Finland. 2005. p. 133-155. (VTT Symposium; No. 237).