Characteristics of 100Cr6 bearing steel after thixoforming process performed with prototype device

作     者：L.ROGAL J.DUTKIEWICZ T.CZEPPE J.BONARSKI B.OLSZOWSKA-SOBIERAJ 

作者机构：Institute of Metallurgy and Materials Science of the Polish Academy of Sciences30-059 Kraków25 Reymonta St.Poland Faculty of Foundry EngineeringUniversity of Science and Technology30-059 Kraków23 Reymonta St.Poland 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：2010年第20卷第S3期

页      面：1033-1036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）] 

主　　题：SSM semi-solid metal thixoforming 100Cr6 steel 

摘      要：A device based on a high pressure die-casting(HPDC) machine was constructed,with a capacity to produce thixo-casts from *** inductive heating to the required semi-solid temperature range,the samples were transported in a protective argon atmosphere to a cylinder of modified HPDC and injected into a pre-heated *** steel 100Cr6(after forging) was used as the feedstock *** metallographic analysis of the steel showed a homogenous structure within a whole volume characterized by a grain size between 2 μm and 8 μ*** scanning calorimetry(DSC) analysis allowed to estimate the process temperature for thixoforming at 1 390 ?C which was attributed to about 45% of a liquid *** such technological parameters after the semi-solid processing the microstructure consisted of globular grains of size from 15 μm to 40 μ*** microstructure of globules indicated predominant presence of martensite(about 76% volume fraction) with residual austenite between plates.X-ray analysis confirmed that the thixo-cast samples contain mainly martensite and residual *** hardness of the initial forged sample was HRC 27 and after the thixoforming process it was HRC 60,which confirms the presence of martensite and *** thixo-casts were subjected to low tempering,at temperature of 150 °C for a period of 2 h,in order to remove stresses created during the process of thixoforming and to increase *** hardness after tempering was HRC ***,in order to identify phases present in the thixo-casts,transmission electron microscopy(TEM) was carried out.