QUALITY OF PRECIPITATION ANNEALING OF HEAT-RESISTANT CAST STEEL USING A TAGUCHI ANALYSIS
Abstract
In this study, the effects of temperature and time on the hardness of heat-resistant cast steel HK30 Nb obtained with centrifugal casting were analysed using the Taguchi method. On the basis of the analysis of the obtained results, we reached reliable conclusions on the improvement of the exploitation properties. The tests showed that precipitation annealing of a HK30 Nb casting can improve the exploitation properties at high temperatures. The defined temperature and holding time comply with the results of the mathematical analysis of the achieved properties, and the presumed research theory from this study can hence be confirmed. The studies showed that the mechanical properties improved during the precipitation-annealing process. During this process, significant transformations of the carbide phase occur in the microstructure, thereby changing its morphology, distribution, size and composition, which was confirmed by testing the microstructure with a scanning electron microscope.
References
2 R. K. Roy, A Primer on the Taguchi Method, 2nd ed., Society of Manufacturing Engineers, Michigan 2010, 304
3 K. Hinkelmann, O. Kempthorne, Design and Analysis of Experiments, Vol. 2: Advanced Experimental Design, John Wiley & Sons, Inc., New Jersey 2005, 816
4 G. Taguchi, S. Chowdhury, Y. Wu, Taguchi's Quality Engineering Handbook, Vol. 2: Advanced Experimental Design, John Wiley & Sons, Inc., New Jersey 2005, 1662
5 P. D. Funkenbusch, Practical Guide to Designed Experiments: A Unified Modular Approach, CRC Press Taylor & Francis Group, New York 2005, 224
6 M. Topalušić, Six sigma methodology and test planning, MSc Thesis, Faculty of Mechanical Engineering and Naval Architecture, Zagreb 2014
7 P. Shailesh, B. Praveen Kumar, S. Sundarrajan, M. Komariahia, Experimental investigation on centrifugal casting of 5500 alloy: A Taguchi approach, Scientific Research and Essays, 7 (2012), 3797–3808, doi:10.5897/SRE12.075
8 M. Jurković, Mathematical modelling engineering of process and systems, Univerzity of Bihać, Bihać 1999, 402
9 S. Butković, E. Šarić, M. Mehmedović, Microstructural changes during heat treatment of sintered austenitic nickel-free stainless steel, Annals of Faculty of Engineering Hunedoara, 16 (2018), 145–148
10 Ð. Dorđe, Physical metallurgy: physics of strength and plasticity 1, Faculty of Metallurgy, Beograd 1990, 401
11 A. Delić, Researching the relations between microstructure and the properties of the heat resisting austenitic steel HK30 modified by niobium in order to improve the properties at elevated temperatures, PhD Thesis, Faculty of Metallurgy and Technology, Zenica 2018
12 D. H. Stamatis, Quality Assurance: Applying Methodologies for Launching New Products, Services, and Customer Satisfaction, CRC Press Taylor & Francis Group, New York 2015, 652
13 A. Vagaska, P. Michal, M. Gombar, E. Fechova, J. Kmec, Simulation of technological process by usage neural networks and factorial design of experiments, MM Science Journal, (2016) 3, 999–1003, doi:10.17973/MMSJ.2016_09_201662
14 J. A. Eguren, A. Esnaola, G. Unzueta, Modelling of an Additive 3D-Printing Process Based on Design of Experiments Methodology, Quality Innovation Prosperity, 24 (2020) 1, doi:10.12776/QIP. V24I1.1435
15 K. Zgodavova, P. Bober, V. Majstorovic, K. Monkova, G. Santos, D. Juhaszova, Innovative Methods for Small Mixed Batches Production System Improvement: The Case of a Bakery Machine Manufacture, Sustainability, 12 (2020) 15, 6266, doi:10.3390/su12156266
