Microstructural Effects on Fatigue Behaviour of a Forged Medium Carbon Microalloyed Steel

Abstract The effect of different microstructures on the fatigue behaviour of a medium carbon vanadium microalloyed steel has been studied. Specimens were subjected to a controlled closed die forging followed by cooling in sand, air or oil, respectively. The hardness and fatigue properties of the microalloyed steel are determined and compared with those of ferrite-pearlite and martensite microstructures obtained by cooling with different mediums after forging. Relatively fine ferrite and pearlite increase the fatigue strength of the steel, while the martensite structure reduces the fatigue strength. Characteristics of fatigue fracture surface morphology are summarized and related to fatigue crack initiation and propagation mechanisms in the forged medium carbon microalloyed steel. The cooling rate has a remarkable effect on the microstructure, hardness, and fatigue behaviour at room temperature.

[1]  S. Gündüz,et al.  Investigation on the behaviour of medium carbon and vanadium microalloyed steels by hot forging test , 2013 .

[2]  Y. Prawoto,et al.  Influence of ferrite fraction within martensite matrix on fatigue crack propagation: an experimental verification with dual phase steel , 2012 .

[3]  T. El-Bitar,et al.  Effect of cooling rate after controlled forging on properties of low carbon multi-microalloyed steels , 2012 .

[4]  M. Torres,et al.  Microstructural effects on fatigue crack growth behavior of a microalloyed steel , 2010 .

[5]  R. Balamuralikrishnan,et al.  Effect of vanadium and titanium modification on the microstructure and mechanical properties of a microalloyed HSLA steel , 2010 .

[6]  A. Babakhani,et al.  Investigation on the effects of hot forging parameters on the austenite grain size of vanadium microalloyed forging steel (30MSV6) , 2010 .

[7]  S. M. R. Ziaeib,et al.  Investigation on the effects of hot forging parameters on the austenite grain size of vanadium microalloyed forging steel (30MSV6) , 2010 .

[8]  K. A. Padmanabhan,et al.  Fatigue behavior of a multiphase medium carbon V-bearing microalloyed steel processed through two thermomechanical routes , 2008 .

[9]  R. Misra,et al.  On the determining role of microstructure of niobium-microalloyed steels with differences in impact toughness , 2008 .

[10]  G. H. Daneshi,et al.  Effect of cooling rate on the microstructure and mechanical properties of microalloyed forging steel , 2008 .

[11]  S. Gündüz,et al.  Clustering effect on high temperature tensile behaviour of vanadium microalloyed steel , 2007 .

[12]  S. Shanmugam,et al.  Impact toughness and microstructure relationship in niobium- and vanadium-microalloyed steels processed with varied cooling rates to similar yield strength , 2006 .

[13]  S. Das,et al.  Effect of cooling rate on structure and properties of an ultra-low carbon HSLA-100 grade steel , 2006 .

[14]  D. S. Sarma,et al.  Influence of thermomechanical treatment on microstructure and mechanical properties of a microalloyed (Nb + V) weather-resistant steel , 2005 .

[15]  Ke Yang,et al.  Effect of toughness on low cycle fatigue behavior of pipeline steels , 2005 .

[16]  P. Chakraborti,et al.  Room temperature low cycle fatigue behaviour of two high strength lamellar duplex ferrite–martensite (DFM) steels , 2005 .

[17]  F. Iacoviello.  Microstructure influence on fatigue crack propagation in sintered stainless steels , 2005 .

[18]  S. Gündüz,et al.  Influence of cooling rate and tempering on precipitation and hardness of vanadium microalloyed steel , 2005 .

[19]  B. Mishra,et al.  An ultra low carbon Cu bearing steel: influence of thermomechanical processing and aging heat treatment on structure and properties , 2004 .

[20]  Jialin Gu,et al.  Fatigue behavior of 1500 MPa bainite/martensite duplex-phase high strength steel , 2004 .

[21]  Takashi Miyata,et al.  Ultra-long cycle fatigue of high-strength carbon steels part II: estimation of fatigue limit for failure from internal inclusions , 2003 .

[22]  B. Mishra,et al.  Influence of thermo-mechanical processing and different post-cooling techniques on structure and properties of an ultra low carbon Cu bearing HSLA forging , 2003 .

[23]  K. A. Padmanabhan,et al.  Low cycle fatigue behavior of a multiphase microalloyed medium carbon steel: comparison between ferrite–pearlite and quenched and tempered microstructures , 2003 .

[24]  D. Matlock,et al.  Microstructures and properties of direct-cooled microalloy forging steels , 2001 .

[25]  B. K. Panigrahi.  Processing of low carbon steel plate and hot strip—An overview , 2001 .

[26]  M. Jahazi,et al.  The influence of hot forging conditions on the microstructure and mechanical properties of two microalloyed steels , 2001 .

[27]  Dagoberto Brandão Santos,et al.  Mechanical properities of an HSLA bainitic steel subjected to controlled rolling with accelerated cooling , 2000 .

[28]  C. Capdevila,et al.  Acicular ferrite formation in a medium carbon steel with a two stage continuous cooling , 1999 .

[29]  R. Elliott,et al.  The relationship between fatigue strength and microstructure in an austempered Cu-Ni-Mn-Mo alloyed ductile iron , 1997 .

[30]  F. Peñalba,et al.  Austenitic grain size evolution and continuous cooling transformation diagrams in vanadium and titanium microalloyed steels , 1996, Journal of Materials Science.

[31]  M. Bepari.  Effects of precipitates on strength and toughness of vanadium structural steels , 1990 .