研究了200、300、400℃温度下N18(NZ2)合金的循环变形行为,同时研究了室温和400℃低周疲劳行为.结果表明:N18(NZ2)合金低周疲劳寿命Nf随着塑性应变范围△εp的增加而降低,并遵循Coffin-Manson关系:Nβf△εp=C;N18(NZ2)合金在400℃高温下,其循环滞后回线出现锯齿状波形,即出现Portevin-LeChatelier效应.且在200、300、400 ℃下,合金表现出与常温下不同的循环特性,呈现出一致循环硬化的现象;在高温,N18(NZ2)合金疲劳断口局部出现韧窝型断裂,并出现细小的二次裂纹.大量二次裂纹的存在是400℃疲劳断口的主要特征.
Effect of temperature on the cyclic deformation behaviors of Zr-Sn-Nb alloy(N18 alloy)at temperatures of 200,300.400℃and the low cycle fatigue(LCF)behaviors at room temperature(RT)and 400℃have been investigated.The results indicate that LCF lifetime of N18 alloy decreases with increasing of the plastic strain range Aεp and obeys Coffin-Manson relation:Nβf△εp=C;At 400℃,there exist sawtooth shaped hysteresis loops,Such phenomenon belongs to"PortevinLeChatelier effect"(PLC effect).At 200,300 and 400℃,there are different cyclic characteristics.At elevated temperature,the fatigue fracture is characterized by dimples and secondary cracks,while mainly by secondary cracks at 400℃.
参考文献
| [1] | 龙世武;吴秦健 .[J].理化检验,1999,35(06):251. |
| [2] | 肖林,顾海澄.锆及锆合金的疲劳行为及其变形机理[J].稀有金属材料与工程,1998(02):69-74. |
| [3] | Armas A F et al.[J].Scripta Materialia,1996,34(02):281. |
| [4] | Moscato M G;Avalos M .[J].Materials Science and Engineering,1997,A234-236:834. |
| [5] | Cottrell A H.Dislocations and Plastic Flow in Crystal[M].Oxford:Oxford University Press,1953:111. |
| [6] | Kuhlmann-WilsdorfD et al.[J].Materials Science and Engineering,1979,37:111. |
| [7] | Li Cong et al.[J].Journal of Nuclear Materials,2003,321:60. |
| [8] | Landgrf R W;Morrow J D;Endo T .[J].Journal of Mater,1969,4:176. |
| [9] | Pandarinathan P R;Vasudevan P .[J].Journal of Nuclear Materials,1980,91:47. |
| [10] | Armas A F et al.[J].Scripta Metallurgica et Materialia,1996,34:281. |
| [11] | Xiao Lin;Gu Haicheng .Low cycle fatigue properties and microscopic deformation structure of Zircaloy-4 in recrystallized and stress-relieved conditions[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,1999(1/2):213-217. |
| [12] | 凌绪玉,李聪,沈保罗,王延峰,高升吉,应诗浩.Zr-4合金低周疲劳特性研究[J].原子能科学技术,2003(z1):77-80. |
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