Study on Internal Pressure Burst, Creep and Fatigue Properties of ODS-FeCrAl Alloy Tube
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摘要: 采用透射电子显微镜、内压爆破、内压蠕变及内压疲劳试验机等研究了氧化物弥散强化（ODS）FeCrAl合金管材显微结构、内压爆破、内压蠕变及内压疲劳性能。结果表明，ODS-FeCrAl合金管材基体中弥散分布大量的纳米第二相颗粒，平均直径约为8.76 nm，体积数密度为6.8×1022 m–3。ODS-FeCrAl合金管材室温爆破强度高达1158 MPa；随着温度的升高，内压爆破强度逐渐下降；1000℃时，ODS-FeCrAl合金管材未丧失承压能力，爆破强度为81 MPa。350℃/30 MPa试验条件下，ODS-FeCrAl合金管材表现出优异的抗内压蠕变性能，蠕变变形量为0.09%。350℃下疲劳峰值加载压力低于30 MPa时，ODS-FeCrAl合金管材1000000次循环加载未出现疲劳失效。ODS-FeCrAl合金管材具有优异的爆破、抗内压蠕变和疲劳性能。
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关键词:
- ODS-FeCrAl 合金管材 /
- 显微结构 /
- 内压爆破 /
- 内压蠕变 /
- 内压疲劳
Abstract: The microstructure, internal pressure burst, creep and fatigue properties of oxide dispersion strengthened (ODS)-FeCrAl alloy tube were studied by transmission electron microscopy (TEM), internal pressure burst, creep and fatigue test machine. The results show that a large number of nano-second phase particles are dispersed in the matrix of ODS-FeCrAl alloy tube, with an average diameter of about 8.76 nm and a volume density of 6.8×1022 m–3. The burst strength of ODS-FeCrAl alloy tube is 1158 MPa at room temperature; The burst strength of the ODS-FeCrAl alloy decrease gradually with the increase of temperature; At 1000℃, the ODS-FeCrAl alloy tube does not lose its pressure-bearing ability, and its burst strength is 81 MPa. The ODS-FeCrAl alloy tube shows excellent internal pressure creep resistance (the creep deformation is 0.9%) under the test condition of 350℃/30 MPa. When the peak fatigue loading pressure is lower than 30 MPa at 350°C, there is no fatigue failure of ODS-FeCrAl alloy tube after 1000000 cycles of loading. The internal pressure burst, creep, and fatigue properties of ODS FeCrAl alloy tube are significantly excellent. -
图 1 ODS-FeCrAl合金管材基体中纳米析出相颗粒微观形貌及尺寸分布
Figure 1. Morphology and Size Distribution of Nano-second Phase Particles Dispersed in the Matrix of ODS-FeCrAl Alloy Tube
图 2 ODS-FeCrAl合金管材t-EBSD的物相分析
Figure 2. Phase Analysis of ODS-FeCrAl Alloy Tube by t-EBSD
图 4 ODS-FeCrAl合金管材破口宏观和微观形貌
Figure 4. Macro and Micro Morphology of Break of ODS-FeCrAl Alloy Tube
图 5 ODS-FeCrAl合金管材350℃保压1000 h后样品形貌
Figure 5. Morphology of ODS-FeCrAl Alloy Tube after Internal Pressure Creep Test at 350°C for 1000 h
图 6 ODS-FeCrAl合金管材350℃内压疲劳试验后样品形貌
Figure 6. Morphology of ODS-FeCrAl Alloy Tube after Internal Pressure Fatigue Test at 350℃
表 1 ODS-FeCrAl合金管材内压蠕变试结果
Table 1. Internal Pressure Creep Test Results of ODS-FeCrAl Alloy Tube
温度/℃ 压力/MPa 时间/h 蠕变应变/% 350 20 1000 0.08 350 30 1000 0.09 
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表 2 ODS-FeCrAl合金管材内压疲劳试验结果
Table 2. Internal Pressure Fatigue Test Results of ODS-FeCrAl Alloy Tube
温度/℃ 峰值压力/MPa 加载次数/次 失效应变/% 350 20 1000000 0.05 350 30 1000000 0.08 350 40 7820 0.13 350 50 4952 0.29
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