Insoo Kim, B. Choi, J. Jung, J. Do, In-Yong Jung, C. Jo
{"title":"Ni基高温合金热暴露过程中组织与力学性能的演变","authors":"Insoo Kim, B. Choi, J. Jung, J. Do, In-Yong Jung, C. Jo","doi":"10.7777/JKFS.2016.36.5.159","DOIUrl":null,"url":null,"abstract":"The microstructural evolution of a cast Ni base superalloy, IN738LC, has been investigated after long term exposure at several temperatures. Most of the fine secondary γ ' particles resolved after 2000 hour exposure at 816 o C. At higher temperatures of 871 o C and 927 o C, secondary γ ' resolved after 1000 hours of exposure, and cuboidal primary γ ' grew with exposure time. During the thermal exposure, σ phase formed at all tested temperatures, and η phase was observed around interdendritic regions due to carbide degeneration. The influence of microstructural evolution during thermal exposure on the mechanical properties has been analyzed. The effects of γ ' particle growth are more pronounced on the high temperature creep properties than on the room temperature tensile properties.","PeriodicalId":16318,"journal":{"name":"Journal of Korea Foundry Society","volume":"7 1","pages":"159-166"},"PeriodicalIF":0.0000,"publicationDate":"2016-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Evolution of Microstructure and Mechanical Properties of a Ni Base Superalloy during Thermal Exposure\",\"authors\":\"Insoo Kim, B. Choi, J. Jung, J. Do, In-Yong Jung, C. Jo\",\"doi\":\"10.7777/JKFS.2016.36.5.159\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The microstructural evolution of a cast Ni base superalloy, IN738LC, has been investigated after long term exposure at several temperatures. Most of the fine secondary γ ' particles resolved after 2000 hour exposure at 816 o C. At higher temperatures of 871 o C and 927 o C, secondary γ ' resolved after 1000 hours of exposure, and cuboidal primary γ ' grew with exposure time. During the thermal exposure, σ phase formed at all tested temperatures, and η phase was observed around interdendritic regions due to carbide degeneration. The influence of microstructural evolution during thermal exposure on the mechanical properties has been analyzed. The effects of γ ' particle growth are more pronounced on the high temperature creep properties than on the room temperature tensile properties.\",\"PeriodicalId\":16318,\"journal\":{\"name\":\"Journal of Korea Foundry Society\",\"volume\":\"7 1\",\"pages\":\"159-166\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2016-10-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Korea Foundry Society\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.7777/JKFS.2016.36.5.159\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Korea Foundry Society","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.7777/JKFS.2016.36.5.159","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Evolution of Microstructure and Mechanical Properties of a Ni Base Superalloy during Thermal Exposure
The microstructural evolution of a cast Ni base superalloy, IN738LC, has been investigated after long term exposure at several temperatures. Most of the fine secondary γ ' particles resolved after 2000 hour exposure at 816 o C. At higher temperatures of 871 o C and 927 o C, secondary γ ' resolved after 1000 hours of exposure, and cuboidal primary γ ' grew with exposure time. During the thermal exposure, σ phase formed at all tested temperatures, and η phase was observed around interdendritic regions due to carbide degeneration. The influence of microstructural evolution during thermal exposure on the mechanical properties has been analyzed. The effects of γ ' particle growth are more pronounced on the high temperature creep properties than on the room temperature tensile properties.