Nature of strain aging stages in bake hardening steel for automotive application

Strain aging behavior of industrially produced ultra low carbon bake hardening (BH) steel for automotive application was investigated. The aging process was studied by the dynamic Young's modulus and amplitude-independent dislocation internal friction measurements with acoustic methods. Analysis of the revealed strain aging stages was carried out and has resulted in the conclusion that formation of interstitial atoms atmospheres on the dislocations is accompanied and substantially affected by the dissolution of their grain boundary segregations.

[1]  K. D. Blauwe,et al.  Effect of dislocation density on the low temperature aging behavior of an ultra low carbon bake hardening steel. , 2000 .

[2]  B. C. Cooman,et al.  Kinetics of low temperature precipitation in a ULC-bake hardening steel , 2001 .

[3]  Sven Vandeputte,et al.  Competition between grain boundary segregation and Cottrell atmosphere formation during static strain aging in ultra low carbon bake hardening steels , 2004 .

[4]  H. Numakura,et al.  Calculation of the strength of Snoek relaxation in dilute ternary B.C.C. alloys , 1995 .

[5]  A. Cochardt,et al.  Interaction between dislocations and interstitial atoms in body-centered cubic metals , 1955 .

[6]  B. Buchmayr,et al.  A Contribution to the Increase in Yield Strength during the Bake Hardening Process , 1997 .

[7]  E. Pink,et al.  Characterization of medium- and low-temperature carbides in a low-carbon steel by internal friction , 1996 .

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

[9]  H. Grabke.  Surface and grain boundary segregation on and in iron , 1986 .

[10]  B. C. De Cooman,et al.  A Model for the Cottrell Atmosphere Formation During Aging of Ultra Low Carbon Bake Hardening Steels , 2000 .

[11]  D. Bacon,et al.  Computer simulation of interaction of an edge dislocation with a carbon interstitial in α-iron and effects on glide , 2007 .

[12]  V. Gavriljuk,et al.  Decomposition of cementite in pearlitic steel due to plastic deformation , 2003 .

[13]  A. Granato,et al.  Theory of Mechanical Damping Due to Dislocations , 1956 .

[14]  H. Hougardy,et al.  On the mechanism of bake-hardening , 1993 .

[15]  B. C. Cooman,et al.  Kinetics of Cottrell atmosphere formation during strain aging of ultra-low carbon steels. , 2000 .

[16]  B. C. Cooman,et al.  Static strain aging behavior of ultra low carbon bake hardening steel , 1999 .