Development of Hollow Ingot for Large Forging

Autor:	Shigeyoshi Yamaura, Takesaburo Nishioka, Jun-ichi Matsuno, Yoshiharu Iida, Kazuo Asoh, Takemi Yamamoto
Rok vydání:	1982
Předmět:	Materials science Metallurgy Metals and Alloys General Engineering Core (manufacturing) Condensed Matter Physics medicine.disease_cause Pressure vessel Forging Internal quality Mold Materials Chemistry medicine Development (differential geometry) Physical and Theoretical Chemistry Ingot
Zdroj:	Transactions of the Iron and Steel Institute of Japan. 22:333-341
ISSN:	1881-1183 0021-1583
Popis:	A new method to make hollow ingots was developed to produce cylinder-type forgings economically.The key-point of this method is the structure of the core which, consisting mainly of outer and inner steel pipes and intermediate special refractory, can readily be constructed, set in the mold and pulled out from the ingot, and which enables to control the cooling from inner surface of the ingot, without such defects as inner-side cracks.Large hollow ingots up to 200t can be made by this method with less segregation than that of conventional ingots and with such small porosities that close and diminish at forging ratio of about 2.Thus, hollow ingots are utilized as materials for high grade forgings, such as pressure vessels, resulting in effective saving of production cost.Compared with conventional ingots, hollow ingots have following characteristics of solidification;(1) Total solidification time is short.(2) Minimum solidification rate is high.(3) Final solidification is not so rapia.(4) Solidification from inner surface is slow.Every feature in the internal quality of hollow ingot can be explained from these characteristics of solidification.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60266e0c9fdf8c62afc3318055e0ae03 https://doi.org/10.2355/isijinternational1966.22.333 Zobrazit plný text záznamu