Effect of a Thermal Welding Cycle on the Properties of a Reactor Vessel Shell

{"title":"Effect of a Thermal Welding Cycle on the Properties of a Reactor Vessel Shell","authors":"A. A. Chernobaeva,&nbsp;O. D. Chebotayov,&nbsp;R. O. Polyakova,&nbsp;D. Yu. Erak,&nbsp;Yu. E. Pesnya,&nbsp;V. V. Trofimchuk,&nbsp;D. A. Mal’tsev,&nbsp;D. A. Zhurko,&nbsp;M. A. Skundin,&nbsp;S. A. Bubyakin","doi":"10.1134/S0036029524702185","DOIUrl":null,"url":null,"abstract":"<p><b>Abstract</b>—The structure, hardness, and ductile–brittle transition temperature (DBTT determined on small Charpy specimens) of the heat-affected zone (HAZ) of two standard welded joints of a VVER reactor vessel made of 15Kh2NMFA-A steel with different nickel contents (1.34 and 1.46 wt %) are studied. Two (high- and low-hardness) subzones are distinguished in the HAZ. The DBTT of the high-hardness subzone is shown to be 60–70°C lower than that of the base metal, which is caused by the formation of martensite and lower bainite structures and grain refinement. The DBTT of the low-hardness subzone is 20–30°C lower than that of the base metal, which is explained by a lower density of carbides in this zone.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 5","pages":"1175 - 1181"},"PeriodicalIF":0.4000,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Metallurgy (Metally)","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0036029524702185","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}