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10 th INTERNATIONAL SYMPOSIUM OF CROATIAN METALLURGICAL SOCIETY 11 th INTERNATIONAL SYMPOSIUM OF CROATIAN METALLURGICAL SOCIETY Al the informations please see: http://public.carnet.hr/metlurg SHMD´2012. SHMD´2014. «MATERIALS AND METALLUARGY» CALL FOR PARTICIPATION The 10th and 11th Symposiums are also in the “Calendar of International Conferences for 2012 and 2014.” (Meeting of World Metallurgical Society’s, Düsseldorf, November 2009) CROATIA, June, 2012., 2014. 312 METALURGIJA 49 (2010) 4, 312
O. HÍRE[, I. BARÉNY MECHANICAL PROPERTIES OF FORGINGS DEPENDING ON THE CHANGES IN SHAPE AND CHEMICAL COMPOSITION OF INCLUSIONS INTRODUCTION Enlargement of quality requirements in metallurgical semi products used in cannon barrels production (forgings) has resulted in substantially increased number of defective products. The main issues are poor quality of plastic properties and yield point of processed materials. Careful analysis of forgings technology and adaptation of its constituent phases has not resulted in the quality enhancement of the forgings. Consequently, the issue is searched in metallurgical phase of production technology. 1-3. MATERIAL AND METHODS USED IN EXPERIMENT The experiment is aimed at the quality of bar shaped steel forgings of large dimensions with diameter 350 mm and length 8500 mm. The forgings are made of medium alloyed steel with chemical composition and mechanical properties according to Table 1. Cannon barrel steels have a favorable relation between plastic and strength properties and high hardening ISSN 0543-5846 METABK 49(4) 313-316 (2010) UDC – UDK 621.73.042:669.1=111 Received – Prispjelo: 2009-01-06 Accepted – Prihva}eno: 2010-02-27 Preliminary Note – Prethodno priop}enje The article deals with mechanical properties of forgings used for special technology in cannon barrels production. The forgings are treated by elctroslag remelting technology (ESR) to enhance its plastic properties and yield point. Described experiments are focused on mechanical properties and metallurgical quality (microstructure) of steels from which are the forgings made. The article includes microstructure photographs and description of inclusions located in examined steels. Experimental results compare forgings treated by ESR and next ones without ESR. Key words: medium alloyed steel, ingot, forging, electroslag remelting, quality, mechanical properties, non-metallic folds Mehani~ka svojstva otkivaka u ovisnosti od izmjene oblika i kemijskog sastava uklju~aka. ^lanak daje prikaz mehani~kih svojstava otkivaka koji se rabe pri posebnoj tehnologiji za topovske cijevi. Otkivci su tretirani elektro pretaljivanjem pod troskom glede povi{enja plasti~nih svojstava i granica razlu~enja. Eksperiment se fokusira na mehani~ka svojstva, mikrostrukturu i metalur{ku kakvo}u materijala otkivka. Rezultati eksperimenta uspore|uju otkivke sa i bez pretaljivanja pod troskom. Klju~ne rije~i: srednje legirani ~elik, ingot, otkivak, pretaljivanje pod troskom, mehani~ka svojstva, nemetalni uklju~ci O. Híre{, I. Barényi, Faculty of special technology, Alexnader Dubcek University of Trencin, Slovakia Table 1 Characteristics of examined steel 4 Chemical composition (wt. %) C Ni Cr Mo Si 0,35 3,0 1,0 0,25 0,30 Mn Pmax Smax Cumax 0,40 0,025 0,025 0,030 Mechanical properties Rp0,2 Z KCV / MPa / /%/ / J/cm 2 / 873 25 34 capacity (over 150 mm). These conditions make steel suitable for forgings of large dimensions 3, 5. Methodology of testing is performed according to the following steps: – Testing mechanical properties on samples from defective forgings prepared of originally used steel – Detailed analysis of solid phase on samples from originally used steel and following evaluation of its metallurgical quality – Enhancement of metallurgical quality of originally used steel by application of ESR (Electroslag Remelting) METALURGIJA 49 (2010) 4, 313-316 313
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