S18  Processos Mecânico-Metalúrgicos    Titulo: DETERMINAÇÃO DE MACROINCLUSÕES EM TARUGOS LINGOTADOS CONTINUAMENTE UTILIZANDO TÉCNICAS ULTRA-SÔNICAS   Resumo : THE DETERMINATION OF THE LEVEL OF INCLUSIONS OF BILLETS GOTTEN IN CONTINUOUS CASTING IS OF BASIC IMPORTANCE IN THE PROCESS OF STEEL PRODUCTION, THEREFORE ITS LEVEL INDICATES THE DEGREE OF CLEANNESS OF THE MATERIAL THAT LATER WILL BE PLATED. THIS WORK PRESENTS THE PRELIMINARY RESULTS OF THE ADAPTATION OF ONE TECHNIQUE OF ULTRASONIC INSPECTION THAT IT AIMS AT TO DETERMINE THE PRESENCE OF MACROINCLUSIONS IN BILLETS OF CONTINUOUS CASTING. SAMPLES OF BILLETS HAD BEEN STRESSED WITH THE OBJECTIVE TO BREAK UP AND/OR TO PROLONGATE THE MACROINCLUSIONS, THUS MAGNIFYING THE DEGREE OF DETENTION FOR THE ULTRASONIC INSPECTION. LATER THE SAMPLES HAD BEEN INSPECTED BY ULTRASOUND FOR THE VERIFICATION OF POSSIBLE DISCONTINUITIES. ON THE BASIS OF THE LOCATION OF THE DISCONTINUITIES, HAD BEEN MADE CUTS IN THE SAMPLES, WITH INTENTION TO DEFINE THE TYPE AND TO DETERMINE ITS DIMENSIONS THROUGH OPTIC AND ELECTRONIC MICROSCOPY OF SWEEPINGS, RELATING THEM WITH THE GOTTEN ULTRASONIC PROFIT IN THE INSPECTION KEY WORDS-: ULTRASONIC, MACRONCLUSIONS, BILLETS, INGOT CASTING     Autores : Biehl, Luciano Volcanoglo Braga, Manoel Rubens de 0 Leal, Paulo Ribeiro Mariante, Gustavo Roque     Trabalho Completo :   COBEM99 | Comissão  Organizadora | Palestras | Sessões Técnicas | Autor | Simpósios e Sessões Especiais | Revisores |  Título  dos  Trabalhos | Local