Effects of Coarsening of Cementite in Pearlite before Austenitization on Formation of BWING and Mechanical Property in a Steel

Tatsuaki Sakamoto; Sanae Konishi; Yuta Nakanishi; Kiyomichi Nakai; Sengo Kobayashi

doi:10.4028/www.scientific.net/MSF.783-786.992

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Effects of Coarsening of Cementite in Pearlite...

Effects of Coarsening of Cementite in Pearlite before Austenitization on Formation of BWING and Mechanical Property in a Steel

Abstract:

Effect of pre-treatment before austenitization on mechanical property in a steel has been investigated. Pre-treatment was done at 500°C for 600, 1200 and 1800s before austenitization at 1440°C for 120s. This pre-treatment was performed in order to introduce dislocation network into austenite, which acts as nucleation site for “bainite laths within austenite grain (BWING)”. BWING was formed with isothermal holding at 500°C for 10s after austenitization. Micro-Vickers hardness is measured in a steel with and without pre-treatment. The steel with appropriate pre-treatment exhibits high hardness, because large amounts of BWINGs are formed. In the case of cementites in pearlite being coarsened and the distance between cementites becoming large, dislocation network is apt to be introduced into γ. The dislocation network acts as nucleation site for BWING, resulting in the suppression of formation of intergranular bainite. BWINGs strengthen the steel.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

992-996

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.992

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Online since:

May 2014

Authors:

Tatsuaki Sakamoto*, Sanae Konishi, Yuta Nakanishi, Kiyomichi Nakai, Sengo Kobayashi

Keywords:

BWING, Coarsening of Cementite, Hardness, Small Angle Dislocation Network

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