{"title":"Effect of Neodymium Content on Creep Properties of 9Cr-3Co-3W-Nd-B Steel","authors":"T. Hamaguchi, M. Mitsuhara, Hideto Kusuhara","doi":"10.2355/tetsutohagane.tetsu-2021-103","DOIUrl":null,"url":null,"abstract":": The effects of the neodymium content on the creep properties and metallographic structure of 9Cr-3Co-3W-Nd-B steel were investigated. Neodymium had a mild effect on the creep rupture strength at contents up to 0.056 mass%. This suggested that the effects of neodymium compounds and solid-dissolved neodymium were minimal in the microstructures and uniformly creep-deformed parts after normalizing and tempering heat treatment. On the other hand, the reduction of area after creep rupture was improved by the addition of neodymium. Creep rupture occurred at the prior austenite grain boundaries on steel with-out neodymium. Therefore, neodymium conclusively adhered to the segregated sulfur at the prior austenite grain boundaries to suppress the formation of creep cracks.","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":null,"pages":null},"PeriodicalIF":0.3000,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.2355/tetsutohagane.tetsu-2021-103","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
: The effects of the neodymium content on the creep properties and metallographic structure of 9Cr-3Co-3W-Nd-B steel were investigated. Neodymium had a mild effect on the creep rupture strength at contents up to 0.056 mass%. This suggested that the effects of neodymium compounds and solid-dissolved neodymium were minimal in the microstructures and uniformly creep-deformed parts after normalizing and tempering heat treatment. On the other hand, the reduction of area after creep rupture was improved by the addition of neodymium. Creep rupture occurred at the prior austenite grain boundaries on steel with-out neodymium. Therefore, neodymium conclusively adhered to the segregated sulfur at the prior austenite grain boundaries to suppress the formation of creep cracks.
期刊介绍:
The journal ISIJ International first appeared in 1961 under the title Tetsu-to-Hagané Overseas. The title was changed in 1966 to Transactions of The Iron and Steel Institute of Japan and again in 1989 to the current ISIJ International.
The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials.
Classification
I Fundamentals of High Temperature Processes
II Ironmaking
III Steelmaking
IV Casting and Solidification
V Instrumentation, Control, and System Engineering
VI Chemical and Physical Analysis
VII Forming Processing and Thermomechanical Treatment
VIII Welding and Joining
IX Surface Treatment and Corrosion
X Transformations and Microstructures
XI Mechanical Properties
XII Physical Properties
XIII New Materials and Processes
XIV Social and Environmental Engineering.