Influence of austenite structure and its decay products on the quasi-brittle fracture of high strength plate for building construction

V. I. bolshakov, D. V. laukhin, S. V. Ivantsov

Abstract


Influence of the grain size austenite on the formation of bainite, the fracture surface and toughness values of steel plate. Methodology. As a basic material for study was chosen is traditionally used in the construction of low-carbon low alloy steel 09G2S to compare close in chemical composition, but different strength and production technology, high-strength microalloyed  steel  10G2FB.  We  studied:  micro- and  substructure  bainite  fractographic  especially  destruction  of  various  geometrical parameters of packets of bainite and their influence on the toughness indices. Results. Conducted complex investigations possible to establish the relationship between the structure of austenite, the formation of bainite lath, fracture toughness, and surface of 09G2S 10G2FB steels. Originality. It is found that the reason for the decrease in toughness of the hot rolled plate and 09G2S 10G2FB steels is  the  formation  of  fractures  in  portions  quasi-brittle cracking which  are  associated  with  an  increase  in  bainite  structure  steel component,  formed  from  relatively  large  (65 m)  of  austenite  grains. Practical  significance. The  relationship  of  micro- and substructure - the cracking of the surface - toughness enable to adjust operating modes controlled rolling in the manufacture of steel 10G2FB to stabilize the mechanical properties and reduce the rejection toughness.


Keywords


high-strength micro-alloyed steel; steel plate; microstructure; fractography; quasi-brittle fracture; toughness.

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