摘要
研究了一种镍基单晶高温合金CM186LC在两个晶体取向下的高温蠕变性能。在不同的温度压力条件下,对[001]和[011]取向试样均进行拉伸蠕变试验,并用扫描电子显微镜观察各试样断口的微观结构特征。蠕变试验结果显示:在750℃/700 MPa和900℃/320 MPa的蠕变试验条件下,[001]晶体取向试样蠕变寿命高于[011]晶体取向试样,特别是在750℃/700 MPa的蠕变试验条件下,试样各向异性程度更高。利用扫描电子显微镜观察试样的断口和组织结构表明:在750℃/700 MPa试验条件下,[001]取向试样断裂特征为解理型断裂,[011]取向试样断裂特征为剪切断裂;在900℃/320 MPa试验条件下,两种取向试样断裂特征均为韧性断裂。由此可见,晶体取向对镍基单晶高温合金CM186LC的蠕变性能有显著地影响。
Effect of orientation on the creep behavior of nickel-base single crystal superalloy CM186LC is studied in this paper. The crystal orientation has a significant influence on the creep behavior of nickel-base single crystal superalloy at high temperature. In the condition of 750℃/ 700 MPa and 900 ℃/320 MPa, [001 ] crystal orientation specimens showed higher creep life to that of the [011 ] specimens, but in the conditions of 750 ℃/700 MPa, anisotropy is more obvious. As a result of the fracture and structure of SEM, in the condition of 750℃/700MPa, the fracture mode of [001 ] orientation is the cleavage fracture, while the fracture mode of [011 ] orientation is pure shear. At high temperature, the fracture mode turns to be mierovoid coalescence fracture.
出处
《承德石油高等专科学校学报》
CAS
2017年第3期25-27,共3页
Journal of Chengde Petroleum College
关键词
镍基单晶合金
蠕变试验
各向异性
断裂特征
nickel-base single crystal superalloy
creep test
anisotropy
fracture characteristic
