钢管2024，Vol.53Issue(3)：19-23,5.DOI:10.19938/j.steelpipe.1001-2311.2024.3.19.23
长时热暴露对镍铁基高温合金GH2070P组织和性能的影响
Effect of Long-term Thermal Exposure on Microstructure and Performance of GH2070P Ferronickel-based Hi-temperature Alloy
摘要
Abstract
The thermal exposure tests at 675 ℃ and for 1 000,3 000 h and 5 000 h respectively are conducted to the GH2070P ferronickel-based hi-temperature alloy tube as key candidate material for the boiler with 675 ℃ parameter,and the post thermal exposure mechanical properties and microstructure evolutions of the alloy are investigated.The facts as fo-llows are revealed with the alloy tube as thermal exposed at 675 ℃ and for 1 000 hours.The γ'phase is precipitated in grain and the M23C6 carbide phase is precipitated at grain boundary;the ambient temperature tensile strength,the yield strength and the hardness of the alloy are obviously increased,whereas it's impact toughness goes down;along with the increase of thermal exposure time going up to 5 000 h,the size of the γ'phase is coarsened,which is in alignment with the LSW coa-rsening theory;and the size of the M23C6 carbides are increased slightly,but are still presenting an intermittent distribution state at the grain boundary,and no network structure is formed;In general the ambient temperature tensile strength,the yield strength and the hardness of the alloy consistently keep at a rather high level,while its impact toughness reduction speed is getting slow.关键词
镍铁基高温合金/高温热暴露/析出物/组织演变/力学性能Key words
ferronickel-based hi-temperature alloy/high temperature exposure/precipitate/microstructure evolu-tion/mechanical property引用本文复制引用
刘新星,龚巍,饶立文,严靖博,刘鹏,程义..长时热暴露对镍铁基高温合金GH2070P组织和性能的影响[J].钢管,2024,53(3):19-23,5.基金项目
黑龙江省自然科学基金项目(LH2022E075) （LH2022E075）
