Abstract
AISI H11 is a specialized chromium tool steel known for its exceptional toughness and hardness, making it particularly suitable for high-load hot work applications. Its common applications include dies and tools for hot-work forging and other types of metalforming, and helicopter rotor blades. Despite its promise for these applications, H11 steel is not widely employed in die and tool making. To enhance its properties for longer life and improved precision, various heat treatment methods can be applied. This chapter presents the outcomes of mechanical testing conducted on differently heat-treated H11 steel samples, aiming to determine the optimal heat treatment approach for hot work applications. Precision milling and EDM were used to create tensile and impact test specimens. These samples underwent targeted heat treatment sequences, including annealing, hardening, air and oil quenching, and tempering at varying temperatures. Subsequently, the heat-treated samples underwent mechanical tests for hardness (Rockwell), impact toughness (Charpy), and tensile properties (yield strength, ultimate strength, ductility).
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