{"title":"Thermal Stability of Retained Austenite in Isothermally Hardened Structural Steels","authors":"A. Yu. Kaletin, Yu. V. Kaletina","doi":"10.1007/s11041-025-01123-8","DOIUrl":null,"url":null,"abstract":"<p>The effect of temperature-time parameters of isothermal hardening in the bainitic transformation range on the thermal stability of retained austenite and impact toughness of sparingly alloyed structural steels 38KhS (38CrSi) and 60S2 (60Si2) is studied. The amount of retained austenite in the steels is determined by a magnetometric method. The fine structure of foils is investigated. Impact bending tests of samples are carried out. It is shown that the thermal stability of the thin foils of retained austenite at liquid nitrogen temperature correlates with the impact toughness of the steels after the isothermal hardening. A magnetic method for assessing the impact toughness of an isothermally hardened structural steel is suggested.</p>","PeriodicalId":701,"journal":{"name":"Metal Science and Heat Treatment","volume":"67 1-2","pages":"19 - 22"},"PeriodicalIF":0.5000,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metal Science and Heat Treatment","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11041-025-01123-8","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
The effect of temperature-time parameters of isothermal hardening in the bainitic transformation range on the thermal stability of retained austenite and impact toughness of sparingly alloyed structural steels 38KhS (38CrSi) and 60S2 (60Si2) is studied. The amount of retained austenite in the steels is determined by a magnetometric method. The fine structure of foils is investigated. Impact bending tests of samples are carried out. It is shown that the thermal stability of the thin foils of retained austenite at liquid nitrogen temperature correlates with the impact toughness of the steels after the isothermal hardening. A magnetic method for assessing the impact toughness of an isothermally hardened structural steel is suggested.
期刊介绍:
Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering.
Topics covered include:
New structural, high temperature, tool and precision steels;
Cold-resistant, corrosion-resistant and radiation-resistant steels;
Steels with rapid decline of induced properties;
Alloys with shape memory effect;
Bulk-amorphyzable metal alloys;
Microcrystalline alloys;
Nano materials and foam materials for medical use.