摘要
采用扫描电子显微镜(SEM)、电子探针(EPMA)和拉伸性能测试等手段,研究含Ru镍基单晶高温合金的显微组织、偏析行为和拉伸性能。结果表明:铸态下,Re,W强烈偏析于枝晶干而Ta,Al在枝晶间偏聚,Ru及其他元素分布趋于均匀。热处理后,Re,W偏析程度有所减轻;合金枝晶干和枝晶间处的γ'相均呈立方状,体积分数分别为63%和71%,平均尺寸分别为0.40μm和0.54μm。拉伸性能结果表明,随着拉伸温度升高,合金抗拉强度和屈服强度先升高后降低,在760℃时达到最大值,但断后伸长率最小,为8.8%。合金在25℃,760℃和980℃下的断裂机制分别为类解理断裂、滑移分离剪切断裂和韧窝-类解理复合断裂。
The microstructure and tensile property of a Ru-containing Ni base single crystal superalloy were investigated by using scanning electron microscope （SEM）,electrical probe metal analysis （EPMA） and mechanical test.The results reveal that Re and W segregate strongly in the dendrite core,while Ta and Al in the interdendritic region.After heat treatment,the segregation of Re and W decrease.The volume fraction and size of cuboidal γ＇ in the dendrite core and interdendritic region phase is 63％,76％ and 0.40μm,0.54μm respectively.The results of tensile property under various temperatures （25℃,760℃,980℃） show that tensile and yield strength increase first and then decrease with the test temperature increasing.The tensile and yield strength at 760℃ are the best.Unfortunately,the elongation is only 8.8％.Furthermore,the deformation mechanism at 25℃,760℃ and 980℃ are quasi-cleavage mode,slip split mode and the mixture of quasi-cleavage and dimple mode respectively.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2013年第6期20-26,共7页
Journal of Aeronautical Materials
关键词
单晶高温合金
RU
热处理
显微组织
拉伸性能
single crystal superalloy
Ru
heat treatment
microstructure
tensile property
