摘要
提出了一种测定氧化膜生长应力的双面氧化弯曲方法，它不象常规弯曲法那样为防止试样一个侧面发生氧化需镀制保护涂层，因而可用于较高温度及较长时间的氧化情况并可测定Al2O3膜的生长应力．由于高温下合金及薄氧化膜会发生蠕变，从而释放膜内应力，新方法应用了合金的蠕变数据，并采用数值计算法来获得氧化膜应力值．用这种方法测定了Fecralloy（Fe-22Cr-5Al-0．3Y）合金在1000℃空气中氧化形成的Al2O3膜的平均生长应力．Al2O3膜的平均生长应力为压应力，其绝对位随膜厚增大而减小．15h氧化期间，膜内应力大小从-7．94GPa变化到-0．30GPa．
:A new deflection technique has been developed to measure growth stresses in oxide scales.In this method,a coating is not required for protecting one side of the specimen from oxidation,which is different with the conventional deflection method.Terefore,the new method can be applied at high temperature,and the precision for measurement of the stress in alumina scales is improved.An alumina forming alloy,Fecralloy,has been studied with this novel method.During the oxidation at 1000c in air,the absolut value of the average compressive stress in the alumina scale was foud to decrease from-7.94 GPa to -0.30 GPa with increasing thickness of the scale.Creep was foud to take place in the substrate alloy,which was taken into consideration in the stress analysis.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第6期618-622,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金!59701010
