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Microstructures in a carburized steel after isothermal pearlitic treatment

Journal of Materials Science & Technology 2023年第29期160卷 66-75页

作者： J.Abraham Mathews H.Farahani J.Sietsma R.H.Petrov M.G.Mecozzi M.J.Santofimia Department of Materials Science and Engineering Delft University of TechnologyMekelweg 22628 CDDelftThe Netherlands Tata steel Research&Development IJmuidenThe Netherlands Department of Electromechanical Systems and Metal EngineeringGhent UniversityTech Lane Ghent Science park-Campus A ZwijnaardeTechnologiepark 46Belgium

The influence of carbon concentration variations on pearlite formation(20 h at 600℃)in a case-carburized steel is *** resultant microstructure shows three distinct regions:carburized case,a transition region,and the original *** microstructural transition from the case to the core regions is observed to be relatively *** investigated region of the carburized case(0.9 wt.%C)con-tains two types of pearlite:ferrite+cementite and ferrite+M_(23)C_(6),where the pearlitic aggregate with M_(23)C_(6)shows faster formation *** kinetics of pearlite formation in the transition region(0.3 wt.%C)is very slow and is observed with only M_(23)C_(6)*** around 40%austenite decomposes into pearlite in the transition region,which,in comparison to the carburized case region of 0.9 wt.%C is a fraction that is lower by a factor of *** is absent in the investigated core region(0.16 wt.%C).The microstructure in this region is predominantly martensite and pro-eutectoid ferrite,with a fraction of ferrite well below the equilibrium *** formation in this region is limited by the redistribution of mainly Ni,Mn,and Cr,and their resulting solute drag effect on the austenite/ferrite interface.A ther-modynamic and kinetic argumentation of these observations is provided with the help of thermodynamic data,precipitation simulations,and a general mixed-mode Gibbs energy balance model.

关键词： Pearlite formation carburized steel M 2_(3)C_(6)carbide Kinetics Solute drag

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FATIGUE BEHAVIOR OF carburized steel BEFORE CRACK INITIATION

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Acta Metallurgica Sinica(English Letters) 1992年第1期5卷 58-61页

作者： Chen Tiequn Verpoest I. Deruyttere A. Wuhan Inst of Technology Wuhan China

The fatigue behavior of quenched plus tempered carburized steel before crack initiation has been observed in tension-tension fatigue *** was found that fatigue softening and fatigue hardening coexist in this steel.A transition region near the ease depth of the steel divides the cross section of a round speeimen into two parts:the softened part outwards and the hardened part *** degree of fatigue softening in the case and fatigue hardening in the core is increased with the maximum applied cyclic stress and the number of cycles.

关键词： carburized steel fatigue microhardness

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