Pu Li , Yihang Li , Tianhao Guan , Feng Zhao , Tao Suo
{"title":"变形导致晶粒细化的机理分析及 CLAM 钢强度和延展性的改善","authors":"Pu Li , Yihang Li , Tianhao Guan , Feng Zhao , Tao Suo","doi":"10.1016/j.jnucmat.2024.155251","DOIUrl":null,"url":null,"abstract":"<div><p>The mechanical behaviors and deformation mechanisms of Chinese low activation martensitic (CLAM) steel under extreme loading conditions were systematically studied. The mechanical experiments were performed at a wide range of strain rate (from 0.001 to 3500 s<sup>-1</sup>) and temperature (from 300 to 1073 K). The main results show that the strength of the CLAM steel shows an apparent positive strain rate and temperature softening effect. In particular, at quasi-static loading conditions, the elongation of CLAM steel first decreases (300–673 K) and then increases (673–1073 K) with the temperature rising. Under dynamic conditions, the elongation of the CLAM steel is positively correlated with temperature rising and is larger than that under quasi-static loading conditions. The microstructure characterization results indicate that grain refinement during deformation and the positive strain rate effect on elongation are primarily governed by changes in grain size, especially at high temperatures. The relationship between the plasticity capability, precipitates and grain refinement are also analyzed. The obvious competitive mechanisms under different loading conditions in the recrystallization process of the CLAM steel. In summary, precipitates contribute to grain refinement in martensitic structures by providing nucleation sites for new grains and by obstructing dislocation movement, thereby raising the local strain and promoting dynamic recrystallization (DRX). Both of these mechanisms result in a finer and more uniform grain structure, which enhances the mechanical properties of the material, such as strength and toughness.</p></div>","PeriodicalId":373,"journal":{"name":"Journal of Nuclear Materials","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Mechanism analysis of grain refinement caused by deformation and the improvement of strength and ductility of CLAM steel\",\"authors\":\"Pu Li , Yihang Li , Tianhao Guan , Feng Zhao , Tao Suo\",\"doi\":\"10.1016/j.jnucmat.2024.155251\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The mechanical behaviors and deformation mechanisms of Chinese low activation martensitic (CLAM) steel under extreme loading conditions were systematically studied. The mechanical experiments were performed at a wide range of strain rate (from 0.001 to 3500 s<sup>-1</sup>) and temperature (from 300 to 1073 K). The main results show that the strength of the CLAM steel shows an apparent positive strain rate and temperature softening effect. In particular, at quasi-static loading conditions, the elongation of CLAM steel first decreases (300–673 K) and then increases (673–1073 K) with the temperature rising. Under dynamic conditions, the elongation of the CLAM steel is positively correlated with temperature rising and is larger than that under quasi-static loading conditions. The microstructure characterization results indicate that grain refinement during deformation and the positive strain rate effect on elongation are primarily governed by changes in grain size, especially at high temperatures. The relationship between the plasticity capability, precipitates and grain refinement are also analyzed. The obvious competitive mechanisms under different loading conditions in the recrystallization process of the CLAM steel. In summary, precipitates contribute to grain refinement in martensitic structures by providing nucleation sites for new grains and by obstructing dislocation movement, thereby raising the local strain and promoting dynamic recrystallization (DRX). Both of these mechanisms result in a finer and more uniform grain structure, which enhances the mechanical properties of the material, such as strength and toughness.</p></div>\",\"PeriodicalId\":373,\"journal\":{\"name\":\"Journal of Nuclear Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2024-06-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Nuclear Materials\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022311524003532\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Nuclear Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022311524003532","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Mechanism analysis of grain refinement caused by deformation and the improvement of strength and ductility of CLAM steel
The mechanical behaviors and deformation mechanisms of Chinese low activation martensitic (CLAM) steel under extreme loading conditions were systematically studied. The mechanical experiments were performed at a wide range of strain rate (from 0.001 to 3500 s-1) and temperature (from 300 to 1073 K). The main results show that the strength of the CLAM steel shows an apparent positive strain rate and temperature softening effect. In particular, at quasi-static loading conditions, the elongation of CLAM steel first decreases (300–673 K) and then increases (673–1073 K) with the temperature rising. Under dynamic conditions, the elongation of the CLAM steel is positively correlated with temperature rising and is larger than that under quasi-static loading conditions. The microstructure characterization results indicate that grain refinement during deformation and the positive strain rate effect on elongation are primarily governed by changes in grain size, especially at high temperatures. The relationship between the plasticity capability, precipitates and grain refinement are also analyzed. The obvious competitive mechanisms under different loading conditions in the recrystallization process of the CLAM steel. In summary, precipitates contribute to grain refinement in martensitic structures by providing nucleation sites for new grains and by obstructing dislocation movement, thereby raising the local strain and promoting dynamic recrystallization (DRX). Both of these mechanisms result in a finer and more uniform grain structure, which enhances the mechanical properties of the material, such as strength and toughness.
期刊介绍:
The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome.
The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example.
Topics covered by JNM
Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior.
Materials aspects of the entire fuel cycle.
Materials aspects of the actinides and their compounds.
Performance of nuclear waste materials; materials aspects of the immobilization of wastes.
Fusion reactor materials, including first walls, blankets, insulators and magnets.
Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties.
Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.