Structural transformations in nonmagnetic alloy 03KhN40MTYuBR in the hardening process
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The dispersity and morphology of the excess phase depend on the conditions of quenching, plastic deformation, and aging.
The optimal heat treatment of alloy 03KhN40MTYuBR is quenching from 1100°C+aging at 750°C for 15 h, which leads to an even distribution of the particles of strengthening γ' phase with a size of ∼150 Å.
Intermediate deformation after quenching and before aging produces the best combination of mechanical properties.
Aging at temperatures above 750°C induces the formation of lamellar η-phase, which lowers the ductility.
The strength characteristics of alloy 03KhN40MTYuBR can be varied within broad limits (300 to 1500 MPa) by controlling the dispersity and morphology of the strengthening phase and utilizing the substructural hardening effect.
KeywordsMechanical Property Heat Treatment Plastic Deformation Ductility Structural Transformation
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