中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2014年
8期
2535-2542
,共8页
史振学%李嘉荣%刘世忠%王效光
史振學%李嘉榮%劉世忠%王效光
사진학%리가영%류세충%왕효광
单晶高温合金%蠕变性能%组织演化%γ′相%TCP相
單晶高溫閤金%蠕變性能%組織縯化%γ′相%TCP相
단정고온합금%연변성능%조직연화%γ′상%TCP상
single crystal superalloy%creep properties%microstructure evolution%γ′phase%TCP phase
研究[001]取向的镍基单晶高温合金在不同测试条件下的蠕变性能，采用扫描电镜和透射电镜研究合金蠕变断裂后的γ′相、TCP相和位错组织演化特征。结果表明：合金具有良好的蠕变性能，蠕变曲线显示出两种不同的蠕变变形特征。在(760°C,600 MPa)、(850°C,550 MPa)条件下，蠕变第一阶段较长；在(980°C,250 MPa)、(1070°C,140 MPa)和(1100°C,120 MPa)条件下，蠕变第一阶段很短。蠕变断裂后，在(760°C,600 MPa)条件下γ′相形态变化不大；在(850°C,550 MPa)条件下γ′相已经合并长大；在(980°C,250 MPa)条件下基体γ被γ′相包围；在(1070°C,140 MPa)条件下基体γ不再连续；在(1100°C,120 MPa)条件下基体γ厚度进一步增加。在(760°C,600 MPa)、(850°C,550 MPa)和(980°C,250 MPa)条件下合金无TCP相析出，而在(1070°C,140 MPa)和(1100°C,120 MPa)条件下有针状TCP相析出。在低温高应力下，变形特征为位错包括层错的剪切机制；在高温低应力下为位错绕过机制，并在γ/γ′相界面形成位错网。
研究[001]取嚮的鎳基單晶高溫閤金在不同測試條件下的蠕變性能，採用掃描電鏡和透射電鏡研究閤金蠕變斷裂後的γ′相、TCP相和位錯組織縯化特徵。結果錶明：閤金具有良好的蠕變性能，蠕變麯線顯示齣兩種不同的蠕變變形特徵。在(760°C,600 MPa)、(850°C,550 MPa)條件下，蠕變第一階段較長；在(980°C,250 MPa)、(1070°C,140 MPa)和(1100°C,120 MPa)條件下，蠕變第一階段很短。蠕變斷裂後，在(760°C,600 MPa)條件下γ′相形態變化不大；在(850°C,550 MPa)條件下γ′相已經閤併長大；在(980°C,250 MPa)條件下基體γ被γ′相包圍；在(1070°C,140 MPa)條件下基體γ不再連續；在(1100°C,120 MPa)條件下基體γ厚度進一步增加。在(760°C,600 MPa)、(850°C,550 MPa)和(980°C,250 MPa)條件下閤金無TCP相析齣，而在(1070°C,140 MPa)和(1100°C,120 MPa)條件下有針狀TCP相析齣。在低溫高應力下，變形特徵為位錯包括層錯的剪切機製；在高溫低應力下為位錯繞過機製，併在γ/γ′相界麵形成位錯網。
연구[001]취향적얼기단정고온합금재불동측시조건하적연변성능，채용소묘전경화투사전경연구합금연변단렬후적γ′상、TCP상화위착조직연화특정。결과표명：합금구유량호적연변성능，연변곡선현시출량충불동적연변변형특정。재(760°C,600 MPa)、(850°C,550 MPa)조건하，연변제일계단교장；재(980°C,250 MPa)、(1070°C,140 MPa)화(1100°C,120 MPa)조건하，연변제일계단흔단。연변단렬후，재(760°C,600 MPa)조건하γ′상형태변화불대；재(850°C,550 MPa)조건하γ′상이경합병장대；재(980°C,250 MPa)조건하기체γ피γ′상포위；재(1070°C,140 MPa)조건하기체γ불재련속；재(1100°C,120 MPa)조건하기체γ후도진일보증가。재(760°C,600 MPa)、(850°C,550 MPa)화(980°C,250 MPa)조건하합금무TCP상석출，이재(1070°C,140 MPa)화(1100°C,120 MPa)조건하유침상TCP상석출。재저온고응력하，변형특정위위착포괄층착적전절궤제；재고온저응력하위위착요과궤제，병재γ/γ′상계면형성위착망。
The creep properties of nickel-based single crystal superalloy with [001] orientation was investigated at different test conditions. The microstructure evolution of γ′ phase, TCP phase and dislocation characteristic after creep rupture was studied by SEM and TEM. The results show that the alloy has excellent creep properties. Two different types of creep behavior can be shown in the creep curves. The primary creep is characterized by the high amplitude at test conditions of (760 °C, 600 MPa) and (850 °C, 550 MPa) and the primary creep strain is limited at (980 °C, 250 MPa), (1100 °C, 140 MPa) and (1120 °C, 120 MPa). A little change ofγ′precipitate morphology occurs at (760 °C, 600 MPa). The lateral merging of the γ′ precipitate has already begun at (850 °C, 550 MPa). Theγphase is surrounded by theγ′phase at (980 °C, 250 MPa). Theγphase is no longer continuous tested at (1070 °C, 140 MPa). At (1100 °C, 120 MPa), the thickness ofγphase continues to increase. No TCP phase precipitates in the specimens at (760 °C, 600 MPa), (850 °C, 550 MPa) and (980 °C, 250 MPa). Needle shaped TCP phase precipitates in the specimens tested at (1070 °C, 140 MPa) and (1100 °C, 120 MPa). The dislocation shear mechanism including stacking fault formation is operative at lower temperature and high stress. The dislocation by-passing mechanism occurs to form networks atγ/γ′interface under the condition of high temperature and lower stress.
