Microalloyed Steels for Heat Treating Applications at Higher Process Temperatures

作     者：David K.Matlock John G.Speer Steven G.Jansto Marcus Stuart 

作者机构：Advanced Steel Processing and Products Research CenterColorado School of MinesGoldenColorado USA CBMM-Reference MetalsBridgevillePA CBMMSao PauloBrasil 

出 版 物：《Journal of Iron and Steel Research International》 (钢铁研究学报(英文版))

年 卷 期：2011年第18卷第S1期

页      面：80-89页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the sponsors of the Advanced Steel Processing and Products Research Center an NSF Industry/University Cooperative Research Center at the Colorado School of Mines 

主　　题：microalloying niobium thermomechanical processing carburizing abnormal grain growth 

摘      要：The potential is considered for use of microalloyed bar steels,in conjunction with thermomechanical processing,to enhance the properties of steels heat treated at higher process temperatures than have been used *** examples are highlighted:microalloyed spring steels with enhanced resistance to tempering and Nb-modified gear steels for high temperature vacuum carburizing,*** the order of 1050℃ versus 930℃ for a typical gas carburizing *** the spring steel example,the Nb+V steel results in significantly finer prior austenite grain sizes than the other steels considered,enhanced fatigue performance,and improved *** the Nb-modified carburizing steel,Nb additions up to 0.1 wt pct to a Ti-modified 8620 steel,in conjunction with thermomechanical processing to control initial precipitate distributions prior to carburizing,are shown to lead to materials with improved resistance to abnormal austenitic grain growth at the higher process *** content and heating rate to the carburizing temperature were shown to be important variables and suppression of abnormal grain growth was correlated with the development of a critical distribution of fine NbC precipitates,stable at the austenitizing temperature leading to improved fatigue performance in steels with fine and uniform grain *** for extending the results of this study to alloy design and controlled rolling in bar mills are assessed.