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Mechanism of α-Cr precipitation and crystallographic relationships between α-Cr and δ phases in Inconel 718 alloy after long-time thermal exposureZhong-nan Bi,Jian-xin Dong,Mai-cang Zhang,Lei Zheng... mechanism of α-Cr phase in Inconel 718 alloy,the samples after long-time aging at 650 and 677°C were examined by microstructural observations and chemical phase analysis methods.Combining......
shows the OM photographs of the alloy after thermal exposure. As seen, the sharp angle of the primary silicon phase is more rounded and the eutectic silicon phase changes from a long strip to a spherical... J. Cent. South Univ. (2020) 27: 1645-1653 DOI: https://doi.org/10.1007/s11771-020-4396-9 Evolution of surface roughness of a cast Al-Si-Cu piston alloy during thermal exposure BAO Tong(保彤)1, LI......
focused on the dispersion of exhaled droplets and less attention was paid to the co-occupant’s exposure. Meanwhile, a long-term stay of the co-occupant in enclosed environment should be considered since...J. Cent. South Univ. (2012) 19: 645-650 DOI: 10.1007/s11771-012-1051-0 Characteristics of physical blocking on co-occupant’s exposure to respiratory droplet residuals LI Xiao-ping(李晓萍)1, NIU Jian-lei......
of the precipitation of metastable intermetallic phase in Inconel718[J]. Metall Trans A, 1992, 23(7): 2015-2028. Effect of long-time aging on precipitated phase and tensile properties of GH625 alloy LI Ya-min... of long-time aging on the precipitated phase and tensile properties of GH625 alloy was investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffractiometry......
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Influence of Thermal Exposure on Mechanical Properties of C/Al Composite郭树启,隋全武,郭文旭,唐凤军摘 要:<正> In this paper were studied the microstructureand...-ray analyses indicate that there isAl4C3 phase in the composites and its amount inthe composites increases when the composites areexposed.In the case of exposure the strength of thecomposites......
Impermeability of Tunnel Structural material after Exposure to High Temperature张风臣摘 要:<正>Impermeability of tunnel structural material after exposure... material after exposure to 200℃, 300℃, 400℃, 500℃, and 600℃respectively. Structural cementitious material was devised according to the requirements of segment used in Yangtze River tunnel of Wuhan which......
coating was deposited on TC4 titanium alloy using arc ion plating,and the stability of NiCrAlY coating/TC4 substrate system under pure thermal exposure was analyzed in a wide temperature range.During the thermal exposure,β→γ′→γphase transformation takes place in the NiCrAlY coating.The NiCrAlY coating phases totally decompose above the allotropic transformation temperature of TC4.The allotropic......
数)进行不同温度(250,350,450,550 ℃),时间2 h的热暴露试验.采用表面粗糙度仪,金相显微镜,扫描电子显微镜,专业型同步热分析仪等测试方法相互结合,对两种Al-Si合金在高温热暴露条件下表面状态的变化进行研究.结果表明:Al-x%Si二元合金的粗糙度变化基本遵循Ra, T6＞Ra, thermal exposure＞Ra, as-cast的规律；随着热暴露温度的升 高,Al-12...糙度仪最大示值误差10%设置误差棒.由图4可以看出:经过T6热处理后,两种Al-Si合金表面粗糙度明显高于铸态；在经过热暴露处理后,粗糙度较热处理状态大致呈现降低趋势.两种Al-Si合金的表面粗糙度均基本遵循Ra, T6＞Ra, thermal exposure＞ Ra, as-cast.在Al-12%Si中热处理后粗糙度明显增大,在经过250 ℃热暴露后粗糙度继续升高,随着热暴露温度的升高,粗糙......
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