【摘 要】
：
研究了700和900℃时效高温合金IN792组织的演变规律和持久寿命的变化情况。700℃时,随着时效时间延长,γ′和碳化物的形貌、尺寸与分布没有发生变化;持久寿命保持稳定。900℃
论文部分内容阅读
研究了700和900℃时效高温合金IN792组织的演变规律和持久寿命的变化情况。700℃时,随着时效时间延长,γ′和碳化物的形貌、尺寸与分布没有发生变化;持久寿命保持稳定。900℃时,时间延长,γ′发生粗化,并形成条状;且在1007h之后,条状γ′的形态基本不变;但时效到2014h时析出少量的针状TCP相;与热处理状态相比(61h),时效500h时持久寿命下降到30h,降低50%左右;时效到1007h之后,直至2014h,持久寿命不再随时间延长而变化。
The evolution and the change of long-term life of IN792 in 700 and 900 ℃ aging superalloys were studied. At 700 ℃, the morphology, size and distribution of γ ’and carbides did not change with the aging time prolonged, and the durable life expectancy remained stable. At 900 ℃, γ ’coarsen and formed into a strip with the extension of time. After 1007h, the morphology of strip γ’ remained almost unchanged. However, a small amount of needle-like TCP phase precipitated at the time of aging of 2014h. (61h), the aging of 500h aging time dropped to 30h, reduced by about 50%; aging to 1007h, until 2014h, lasting longer life will not change with time.
其他文献
“实在论”是哲学家常常使用的一个术语，围绕着这一术语所形成的“实在论问题”是长期以来哲学上所集中讨论的一个论题。在达米特看来，要解决实在论，就有必要对实在论论题给出科
应用蒸馏法再生废旧钯萃取剂,不仅实现了钯萃取剂的再生,还能有效回收其中残留的铂族金属。主要考察了蒸馏温度、蒸馏时间对于废旧钯萃取剂萃取性能及其铂族金属回收率的影响
A series of Au/[Ni Co/Bi]x/Au(x = 2, 3) films were fabricated by pulsed laser deposition method. In order to induce the in-plane uniaxial magnetic anisotropy(IP
在我国的现代学徒制试点中,不少职业院校反映企业参与积极性不高。现代学徒制本来就是一种企业主体、工作本位的学习形式,又何来企业“不参与”之说?答案只有一个:这些学校搞
研究了液态金属冷却定向凝固条件下Ti-45Al-7Nb(at%)合金的组织特征。结果表明:定向凝固过程中合金的凝固路径及稳态区片层取向均受到抽拉速率的影响。当抽拉速率为0.36mm/mi
The a + b → b phase transformation kinetics of Ti-1300 alloy during continuous heating at different heating rates were investigated using dilatometric method.R
设计了一种基于目标区域Voronoi划分的改进的集中式近似算法,用于计算完伞覆盖目标区域所需要的近似最小节点集.仿真结果表明,该算法能够有效地找到更少的连通覆盖节点,降低
By means of optical microscope(OM), X-ray diffraction(XRD), scanning electron microscopy(SEM)and transmission electron microscopy(TEM) analyses, the microstruct
在我国教育体系中,中等职业教育是其中的重要组成部分,随着社会的不断发展,在近几年来取得显著成绩,但是在发展的过程中,由于新时期大环境的影响,信息社会和知识经济的出现,
4HNR(1,3,6,8-tetra-HN reductase)gene of melanin biosynthesis in Setosphaeria turcica had been cloned successfully by RT-PCR in this study.Both sequences of DNA