Abstract
The patterns of structural transformations and the change in the mechanical properties of a metastable austenitic steel subjected to cold plastic deformation by drawing with high total degrees of compression and subsequent aging were studied in this work. The studies showed that after quenching, the use of intense plastic deformation by drawing revealed the high technological capabilities of the studied austenitic steel. Austenite in the steel is deformation-unstable and turns into deformation martensite during cold plastic deformation by drawing. Aging of deformed steel causes an additional increase in mechanical properties, due to the separation of the intermetallic phase NiAl from the bcc solid solution (strain martensite). It was revealed that almost carbon-free corrosion-resistant austenitic steel, as a result of correctly selected alloying, combines the advantages of three steels: metastable austenitic steels, Transformation-Induced Plasticity (TRIP)-steels and martensitic aging steels. As a result of using all possible hardening mechanisms, a high-strength state was achieved.
Highlights
The use of high-strength, corrosion-resistant steels makes it possible to obtain products with high service properties, to reduce metal loss, and to reduce the metal consumption of products
Martensitic, austenitic and austenitic-ferritic grades are used for the production of corrosion-resistant wire, which is employed in instrumentation, mechanical engineering, and the manufacture of medical instruments
The formation of a high-strength state in steels is achieved by choosing the appropriate alloying principles and obtaining the desired structural class of the material, as well as by combining various hardening mechanisms: solid-solution hardening, strain hardening in matrix phases without phase transitions, strain hardening due to γ → α transformation and dispersion hardening with the release of intermetallic phases
Summary
The use of high-strength, corrosion-resistant steels makes it possible to obtain products with high service properties, to reduce metal loss, and to reduce the metal consumption of products. The creation of a nanocrystalline state in the structure of the material leads to the formation of a fundamentally new complex of high physical and mechanical properties. It has been established [2,3,4] that nanostructured materials and alloys (i.e., ultrafine-grained materials with grain sizes ≤ 100 nm) exhibit very high hardness, strength, impact strength and wear resistance
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