A. Fedoseeva, I. Nikitin, A. Fedoseev, N. Dudova, R. Kaibyshev
{"title":"钽对蒸汽叶片用12%Cr马氏体钢拉伸性能的影响","authors":"A. Fedoseeva, I. Nikitin, A. Fedoseev, N. Dudova, R. Kaibyshev","doi":"10.1063/1.5131965","DOIUrl":null,"url":null,"abstract":"Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 650°C with a strain rate of 2×10−3 s−1. Insignificant increment in ultimate tensile strength and yield strength was revealed in Ta-containing 12%Cr steel.Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 6...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":"15 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of tantalum on the tensile properties of 12%Cr martensitic steels for steam blades\",\"authors\":\"A. Fedoseeva, I. Nikitin, A. Fedoseev, N. Dudova, R. Kaibyshev\",\"doi\":\"10.1063/1.5131965\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 650°C with a strain rate of 2×10−3 s−1. Insignificant increment in ultimate tensile strength and yield strength was revealed in Ta-containing 12%Cr steel.Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 6...\",\"PeriodicalId\":20637,\"journal\":{\"name\":\"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019\",\"volume\":\"15 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-11-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1063/1.5131965\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1063/1.5131965","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Effect of tantalum on the tensile properties of 12%Cr martensitic steels for steam blades
Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 650°C with a strain rate of 2×10−3 s−1. Insignificant increment in ultimate tensile strength and yield strength was revealed in Ta-containing 12%Cr steel.Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior austenite grains was 50 ±5 µm; the fraction of δ-ferrite was less than 10%. The tempering temperature strongly affected the tempered martensite/ferrite lath structure in both steels: the lath width increased from 290±30 to 690±50 nm and dislocation density decreased from to 3×1014 to 1.5×1014 m−2 when tempering temperature increased from 750 to 800°C. The addition of Ta in the 12%Cr-3%Co steel provided the precipitation of Ta-rich MX carbonitrides after heat treatment. The tensile tests were carried out at 20°C and 6...