Effects of Sizes and Aggregate of Bainite Laths on Strength and Elongation in Bainitic Steels

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Both strength and ductility in bainitic steels have been analyzed as functions of size of bainite lath nucleated within austenite grain, hereafter referred to as BWING, the number of BWINGs contained in an aggregate of bainite laths with almost parallel slip systems between neighboring bainite laths, hereafter referred to as ALPS, and related factors. 0.2% proof stress increased with decreasing size of BWING. Dislocation network could be introduced into austenite formed with isothermal holding at 1023 K before austenitization above 1673 K and would act as nucleation site for BWING, resulting in size of BWING being smaller. It could be suggested that almost parallel slip systems in neighboring BWINGs induced large homogeneous deformation, and dense BWINGs in an ALPS increased total elongation. As the number of BWINGs in an ALPS increases, many BWINGs having the larger Schmid factors would exist at many spots, resulting in many initiation sites for deformation and in inducing sufficient deformation of an ALPS. Conclusion is that main factors controlling 0.2% proof stress and total elongation are size of BWING, parallelism of slip systems in neighboring BWINGs, size of ALPS under a fixed size of BWING and the number of BWINGs within an ALPS.

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