Study of Microstructure and Phase Composition of Creep Resistant Cast Steel

Renata Chylińska; Małgorzata Garbiak; Bogdan Piekarski

doi:10.4028/www.scientific.net/MSF.782.335

Paper Titles

Microstructure of CB2 Steel before and after Long-Term Creep Tests
p.311

Microstructural Stability of P23/P91 Dissimilar Welds during Creep at 500°C
p.319

Evaluation of Materials Degradation Extent after their Long Term Exposition in Power Plants Equipments
p.325

Creep of Cast Steel P91 with Weld Joint
p.331

Study of Microstructure and Phase Composition of Creep Resistant Cast Steel
p.335

Microstructural Phenomenon Occurring in Elektron 21 Magnesium Alloy During Creep
p.339

Highly Thermally Stable Light-Weight Al Based Alloys Prepared by Centrifugal Atomization and Powder Compaction
p.347

Microstructure Evolution of Fe-Al-Si and Ti-Al-Si Alloys during High-Temperature Oxidation
p.353

The Study of Iron Intermetallic Phases Morphology with Applying Deep Etching in Secondary Al-Si Alloys
p.359

HomeMaterials Science ForumMaterials Science Forum Vol. 782Study of Microstructure and Phase Composition of...

Study of Microstructure and Phase Composition of Creep Resistant Cast Steel

Abstract:

The study presents the results of the identification of the phase composition of creep resistant cast austenitic 30Ni-18Cr steel with the addition of Ti and Nb after the annealing process conducted at 900°C for 10 and 500 hours. The microstructure of the as-cast steel showed mainly the presence of simple carbides. Depending on the alloy chemical composition, those were the TiC and NbC carbides. In the initial phase of annealing process, the nucleation of small secondary precipitates of chromium carbides Cr₂₃C₆was observed to take place in cast steel microstructure at the matrix / simple carbides interface. After a long-time annealing, a new phase (G phase) was developing; the symbols of the phase were Ni₁₆Ti₆Si₇ and Ni₁₆Nb₆Si₇, respectively. The G phase was enclosing simple carbides forming with them the complexes of primary and secondary precipitates of a very intricate morphology. Chromium carbides Cr₂₃C₆ were also present there.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Materials Science Forum (Volume 782)

Pages:

335-338

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.782.335

Citation:

Cite this paper

Online since:

April 2014

Authors:

Renata Chylińska*, Małgorzata Garbiak, Bogdan Piekarski

Keywords:

Austenitic Cast Steel, Microstructure, Morphology of Precipitates, Phase G

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] L.H. Almeida, A.F. Ribeiro, I. Le May, Microstructural characterization of modified 25Cr-35Ni centrifugally cast steel furnace tubes, Mat. Char. 49 (2003) 219.

DOI: 10.1016/s1044-5803(03)00013-5

Google Scholar

[2] M. Garbiak, Estimated effect of niobium and titanium on micro-structure and mechanical properties of 30Ni-18Cr cast steel, PhD thesis, SUT-Szczecin, Poland, 2006 (in Polish).

Google Scholar

[3] R. Chylińska, The precipitation processes in creep-resistant cast steel of 30Ni-18Cr type stabilised with additions of Nb and Ti, PhD thesis, WPUT-Szczecin, Poland, 2011 (in Polish).

Google Scholar

[4] B. Piekarski, Austenitic steel casting used in constructional of carburising furnaces. Szczecin: Prac. Nauk. Polit. Szczecińskiej 2003, No 573 (in Polish).

Google Scholar

[5] A. Kochmańska, Hot corrosion resistance properties of Al – Si coatings obtained by slurry method, Defect and Diffusion Forum, 326-328 (2012) 273.

DOI: 10.4028/www.scientific.net/ddf.326-328.273

Google Scholar