Effect of aging temperature and martensite by volume on strain aging behaviour of dual phase steel

Abstract A study has been made of the cold deformation aging susceptibility of dual phase steel with 14 and 22% martensite by volume. It was found that yield strength (YS) and ultimate tensile strength (UTS) increased with increasing testing temperature up to 200°C and then decreased at 250°C which indicated that static strain aging is dominant up to 200°C. This aging is associated with free dislocations in the ferrite as a result of the austenite–martensite transformation, which become preferential sites for solute atom diffusion. At higher temperature (250°C) a softening effect is dominant due to tempering of martensite. It was also observed that at a given aging temperature YS, UTS and ΔY (increase in stress due to strain aging) increased with by volume of martensite.

[1]  A. Cottrell,et al.  Dislocation Theory of Yielding and Strain Ageing of Iron , 1949 .

[2]  Ali Bayram,et al.  Effects of microstructure and notches on the mechanical properties of dual-phase steels , 1999 .

[3]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[4]  M. Erdogan,et al.  Surface carburised AISI 8620 steel with dual phase core microstructure , 2002 .

[5]  R. Priestner,et al.  Effect of rolling in the intercritical region on the tensile properties of dual-phase steel , 1998 .

[6]  G. Krauss,et al.  The morphology of martensite in iron alloys , 1971 .

[7]  D. Wilson,et al.  The contribution of atmosphere locking to the strain-ageing of low carbon steels , 1960 .

[8]  R. Priestner,et al.  Influence of ferrite-martensite microstructural morphology on tensile properties of dual-phase steel , 1996, Journal of Materials Science.

[9]  J. D. Baird.  The effects of strain-ageing due to interstitial solutes on the mechanical properties of metals , 1971 .

[10]  T. N. Baker,et al.  The tensile deformation of a martensitic dual-phase steel , 1984 .

[11]  M. Erdogan.  Effect of austenite dispersion on phase transformation in dual phase steel , 2003 .

[12]  M. Sarwar,et al.  Influence of epitaxial ferrite on tensile properties of dual phase steel , 2007 .

[13]  M. S. Rashid.  Dual Phase Steels , 1981 .

[14]  R. G. Davies.  Early stages of yielding and strain aging of a vanadium-containing dual-phase steel , 1979 .

[15]  M. Erdogan,et al.  The effect of martensite volume fraction and particle size on the tensile properties of a surface-carburized AISI 8620 steel with a dual-phase core microstructure , 2002 .

[16]  W. C. Leslie,et al.  The physical metallurgy of steels , 1981 .

[17]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[18]  M. Erdogan,et al.  The effect of martensite particle size on tensile fracture of surface-carburised AISI 8620 steel with dual phase core microstructure , 2002 .

[19]  L. Hein,et al.  Mechanical behaviour of strain aged dual phase steels , 1999 .

[20]  M. Meyers,et al.  Frontiers in materials technologies , 1985 .

[21]  M. Strangwood,et al.  Bauschinger effect in Nb and V alloyed line-pipe steels , 2009 .

[22]  E. Ahmad,et al.  Effect of microvoid formation on the tensile properties of dual-phase steel , 2000 .

[23]  A. Ekrami,et al.  High temperature mechanical properties of dual phase steels , 2005 .

[24]  R. Mohan,et al.  Cracking instabilities in a low-carbon steel susceptible to dynamic strain aging , 1998 .