Thermomechanical Processing of Medium-Carbon Boron-Bearing Microalloyed-Steel Forgings Targeting Normalized-like Structure and Properties
Piotr Skubisz, Piotr Micek, Stanisław Flaga
TL;DR
This paper explores how to process a specific type of steel to achieve desired properties without traditional heat treatment, using direct cooling after forging.
Contribution
The study introduces a novel thermomechanical processing route using direct cooling to achieve microstructures and properties comparable to conventional normalization.
Findings
Direct cooling produced a microstructure of grain-boundary ferrite and pearlite with high tensile properties.
The direct cooling method achieved Re ≈ 610 MPa, Rm ≈ 910 MPa, and elongation A5 ≥ 12%.
The method offers energy-efficient alternatives to conventional normalizing for high-duty steel parts.
Abstract
The paper presents designing thermomechanical processing routes for medium-carbon boron-bearing microalloyed steel and investigates their effect on microstructure–property characteristics obtained through controlled cooling directly from hot forging temperature. Direct cooling was carried out in situ within the industrial process of hot forging, replacing conventional heat treatment with slow and accelerated air cooling, realized with a fully automated fan-cooling laboratory conveyor which accommodates the desired cooling strategy. Comparative analysis of conventionally normalized and direct-cooled microstructure and mechanical properties obtained under varied thermo-mechanical conditions is presented to investigate the potential of medium-carbon microalloyed steel with boron addition for producing tailored properties comparable to those of the normalized condition. The obtained…
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Taxonomy
TopicsMetallurgy and Material Forming · Microstructure and Mechanical Properties of Steels · Advanced machining processes and optimization