摘要
研究了N36锆合金包壳管在温度为593~723 K、应力为60~160 MPa条件下的拉伸蠕变行为。结果表明,本试验条件下N36锆合金管材存在不同的蠕变变形机制。593~673K下低应力范围内,蠕变应力因子n约为3,蠕变表观激活能Qapp≈150 k J·mol-1,蠕变变形受位错的粘滞性滑移过程控制;高应力范围内蠕变应力因子n为5~6,蠕变激活能Qapp≈170 k J·mol-1,遵循典型的5次幂律蠕变规律,蠕变变形受位错攀移过程控制。在723 K时,高应力范围内发生幂律失效。N36锆合金包壳管表现为典型的Class A型合金蠕变特征,表现出与Zircaloy合金不同的蠕变规律。
High temperature tensile creep behavior of N36 zirconium alloy cladding tubes in the temperature range from 593 K to 723 K and the stress range from 60 MPa to 160 MPa was investigated. The results show that there are three distinct rate-controlled creep mechanisms for N36 zirconium alloy cladding tubes. In the temperature range from 593 K to 673 K the stress exponent n is ~3 and creep activation Q≈150 k J·mol-1 is found in the low applied stress region, which means the dominant process is viscous-glide-controlled. But in the high applied stress region the stress exponent n is 5~6 and the creep activation Q≈170 k J·mol-1 is found, which obeys the typical five power law creep mechanism controlled by the climb of edge dislocations. At 723 K and with high applied stress the power law breakdown appears and the exact mechanism is not clear by now. In the test condition N36 zirconium alloy cladding tubes exhibit a type of creep behavior similar to that noted in class-I（A） alloys, which is very different from zircaloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第5期1149-1153,共5页
Rare Metal Materials and Engineering
关键词
N36锆合金包壳管
高温蠕变
蠕变机制
N36 zirconium alloy cladding tube high temperature creep creep mechanism
