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1
Content available Comparison of Methods for Determining the Ferrite Content in Duplex Cast Steels
100%
Kaňa V. , Pernica V. , Zadera A. , Krutiš V.
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tom iss. 2
85--90
EN
The paper is concerned with comparing the methods for determining the ferrite content in castings from duplex stainless steels. It uses Schaeffler diagram, empirical formula based calculation, image analysis of metallographic sample, X-ray diffraction and measurement with a feritscope. The influence of wall thickness of the casting on the ferrite content was tested too. The results of the experiments show that the casting thickness of 25 or 60 mm does not have a significant effect on the measured amount of ferrite. The image analysis of metallographic sample and the measurement with the feritscope appear to be the most suitable methods. On the contrary, predictive methods, such as Schaeffler diagram or empirical formula based calculation are only indicative and cannot replace the real measurements. X-ray diffraction seems to be the least suitable measuring method. Values of ferrite content measured in such a way often deviated from the values measured by image analysis and with feritscope.
2
Content available remote Solidification of heavy castings
100%
Zadera A. , Senberger J. , Pluhacek J. , Carbol Z.
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2011
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tom Vol. 11, iss. 1
109-112
EN
Quality of the casting material is influenced by great numbers of material properties, metallurgical treatment, and particular solidification conditions too. In the case of solidification of heavy castings the properties and quality of the casting material are considerably changed in consequence of running segregation phenomena, worsen metal feeding conditions, and microporosity formation etc. It can even result in defaulting the required strengths and plasticity of the casting material. The work deals with changes of chemical composition and changes of mechanical properties in places with a long solidification time corresponding to them.
3
Content available remote Checking the metallurgy with the aid of inclusion analysis
100%
Senberger J. , Zadera A. , Cech J.
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2011
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tom Vol. 11, iss. 1
118-122
EN
Results of studying the influence of inclusion morphology on properties of heavy casting are given. The inclusion morphology is dependent on content and kind of the deoxidizing element. Due to segregations the inclusions can be formed in heavy castings under different conditions (by concentration of deoxidizing elements) than in castings of common size. In heavy casting during deoxidation the inclusions of the IVth type occur more frequently. Deoxidation with zirconium shows to be for some heavy casting unsuitable one. Similarly in castings deoxidized with cerium and lanthanum the inclusions of greater sizes occur that can unfavourably influence the steel properties and increase the tendency to crack formation. The inclusion morphology after deoxidation with magnesium is also unsuitable for heavy castings.
4
Content available Integration of Virtual Engineering and Additive Manufacturing for Rapid Prototyping of Precision Castings
89%
Krutiš V. , Šprta P. , Kaňa V. , Zadera A. , Cileček J. , Krutiš V. , Šprta P. , Kaňa V. , Zadera A. , Cileček J.
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nr 1
5
Content available Comparison of Methods for Determining the Ferrite Content in Duplex Cast Steels
88%
Kaňa V. , Pernica V. , Zadera A. , Krutiš V.
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