Xiaoli Chu , Yu Li , Chun Xu , Wei Li , Bin Fu , Xiaoshuai Jia
{"title":"三功能共沉淀通过诱导结构异质性和细化低堆积故障能 17Mn 钢中的纳米孪晶提高低温韧性","authors":"Xiaoli Chu , Yu Li , Chun Xu , Wei Li , Bin Fu , Xiaoshuai Jia","doi":"10.1016/j.ijplas.2024.104014","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, an innovative tri-functional co-nanoprecipitation strategy was employed to enhance the mechanical properties of a low stacking-fault energy (SFE) 17Mn steel for cryogenic applications. By combining severe cold deformation and subsequent annealing, a hierarchical structure emerged, featuring (Ti, Nb)C carbide (∼10 nm) and Cu-rich intermetallic (∼2 nm) in the austenitic matrix with heterogeneous grain size distributions. The co-precipitation (CP) sample exhibited superior performance compared to single-precipitation (SP) steel, with a yield strength of ∼1150 MPa, tensile elongation of ∼44.8 %, and an impact toughness of ∼110 J at liquid nitrogen temperature (LNT), even surpassing the base-17Mn steel. The CP-17Mn samples displayed a higher density and thinner nano-twins at larger strains, leading to a rapid increase in geometrically necessary dislocations (GNDs). The detrimental martensitic transformation was effectively suppressed during both tensile and impact tests. The observed inverse strength-ductility and strength-toughness trade-off can be attributed to the tri-functional co-precipitates’ roles: they provide disperse strengthening, induce structural heterogeneity, and act as effective barriers for twin thickening. The large-sized (Ti, Nb)C carbides facilitate grain refinement and pin boundary migration, while the smaller Cu-rich intermetallic inhibits the growth and thickening of nano-twins, preventing further dislocation movement due to their strong stress fields at the twin-precipitate interactions. This novel mechanism paves the way for developing higher-performance steels with fine and dense nano-twins at cryogenic conditions.</p></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":null,"pages":null},"PeriodicalIF":9.4000,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Tri-functional co-nanoprecipitates enhanced cryogenic ductility by inducing structural heterogeneity and refining nano-twins in a low-stacking-fault-energy 17Mn steel\",\"authors\":\"Xiaoli Chu , Yu Li , Chun Xu , Wei Li , Bin Fu , Xiaoshuai Jia\",\"doi\":\"10.1016/j.ijplas.2024.104014\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this study, an innovative tri-functional co-nanoprecipitation strategy was employed to enhance the mechanical properties of a low stacking-fault energy (SFE) 17Mn steel for cryogenic applications. By combining severe cold deformation and subsequent annealing, a hierarchical structure emerged, featuring (Ti, Nb)C carbide (∼10 nm) and Cu-rich intermetallic (∼2 nm) in the austenitic matrix with heterogeneous grain size distributions. The co-precipitation (CP) sample exhibited superior performance compared to single-precipitation (SP) steel, with a yield strength of ∼1150 MPa, tensile elongation of ∼44.8 %, and an impact toughness of ∼110 J at liquid nitrogen temperature (LNT), even surpassing the base-17Mn steel. The CP-17Mn samples displayed a higher density and thinner nano-twins at larger strains, leading to a rapid increase in geometrically necessary dislocations (GNDs). The detrimental martensitic transformation was effectively suppressed during both tensile and impact tests. The observed inverse strength-ductility and strength-toughness trade-off can be attributed to the tri-functional co-precipitates’ roles: they provide disperse strengthening, induce structural heterogeneity, and act as effective barriers for twin thickening. The large-sized (Ti, Nb)C carbides facilitate grain refinement and pin boundary migration, while the smaller Cu-rich intermetallic inhibits the growth and thickening of nano-twins, preventing further dislocation movement due to their strong stress fields at the twin-precipitate interactions. This novel mechanism paves the way for developing higher-performance steels with fine and dense nano-twins at cryogenic conditions.</p></div>\",\"PeriodicalId\":340,\"journal\":{\"name\":\"International Journal of Plasticity\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":9.4000,\"publicationDate\":\"2024-05-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Plasticity\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0749641924001414\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Plasticity","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0749641924001414","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Tri-functional co-nanoprecipitates enhanced cryogenic ductility by inducing structural heterogeneity and refining nano-twins in a low-stacking-fault-energy 17Mn steel
In this study, an innovative tri-functional co-nanoprecipitation strategy was employed to enhance the mechanical properties of a low stacking-fault energy (SFE) 17Mn steel for cryogenic applications. By combining severe cold deformation and subsequent annealing, a hierarchical structure emerged, featuring (Ti, Nb)C carbide (∼10 nm) and Cu-rich intermetallic (∼2 nm) in the austenitic matrix with heterogeneous grain size distributions. The co-precipitation (CP) sample exhibited superior performance compared to single-precipitation (SP) steel, with a yield strength of ∼1150 MPa, tensile elongation of ∼44.8 %, and an impact toughness of ∼110 J at liquid nitrogen temperature (LNT), even surpassing the base-17Mn steel. The CP-17Mn samples displayed a higher density and thinner nano-twins at larger strains, leading to a rapid increase in geometrically necessary dislocations (GNDs). The detrimental martensitic transformation was effectively suppressed during both tensile and impact tests. The observed inverse strength-ductility and strength-toughness trade-off can be attributed to the tri-functional co-precipitates’ roles: they provide disperse strengthening, induce structural heterogeneity, and act as effective barriers for twin thickening. The large-sized (Ti, Nb)C carbides facilitate grain refinement and pin boundary migration, while the smaller Cu-rich intermetallic inhibits the growth and thickening of nano-twins, preventing further dislocation movement due to their strong stress fields at the twin-precipitate interactions. This novel mechanism paves the way for developing higher-performance steels with fine and dense nano-twins at cryogenic conditions.
期刊介绍:
International Journal of Plasticity aims to present original research encompassing all facets of plastic deformation, damage, and fracture behavior in both isotropic and anisotropic solids. This includes exploring the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena.
Topics of interest span the plastic behavior of single crystals and polycrystalline metals, ceramics, rocks, soils, composites, nanocrystalline and microelectronics materials, shape memory alloys, ferroelectric ceramics, thin films, and polymers. Additionally, the journal covers plasticity aspects of failure and fracture mechanics. Contributions involving significant experimental, numerical, or theoretical advancements that enhance the understanding of the plastic behavior of solids are particularly valued. Papers addressing the modeling of finite nonlinear elastic deformation, bearing similarities to the modeling of plastic deformation, are also welcomed.