Phase Transformation under Continuous Cooling Conditions in Medium Carbon Microalloyed Steels

作     者：Manuel Gomez Lucia Rancel Esther Escudero Sebastian F.Medina 

作者机构：National Centre for Metallurgical ResearchCENIM-CSICAv.Gregorio del Amo 828040 MadridSpain 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2014年第30卷第5期

页      面：511-516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 financial support of Spanish Ministry of Economy and Competitiveness through the project ref.MAT2011-29039-C02-02 

主　　题：Microalloyed steel Phase transformation Precipitation Dilatometry Continuous cooling transformation diagram 

摘      要：Several 35CrMo4 and 38MnV7 steels with different additions of Ti and V were manufactured by electroslag remelting. The influence of the alloying and microalloying elements on phase transformation at different cooling rates was studied and the continuous cooling transformation diagrams were plotted. In order to optimize the heat treatment and improve the mechanical properties, the range of cooling rates leading to a fully bainitic microstructure （without ferrite, pearlite and especially without martensite） was determined. Bainite and martensite transformation start temperatures （Bs, Ms） were also established and compared with the values predicted by empirical equations. The important role of precipitates （especially V carbonitride particles） on final microstructure and mechanical properties was assessed.