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Microstructure and composition characteristics of transition zone in diffusion bonding of Fe3Al intermetallics to Q235 low carbon steelWU Hui-qiang(吴会强)1, FENG Ji-cai(冯吉才)1, LI Ya-jiang(李亚江)2, WANG... University, Jinan 250061, China)Abstract:The sound joints of Fe3Al intermetallics and Q235 low carbon steel dissimilar materials were made by vacuum diffusion bonding process at 1050-1100℃,9.8MPa held......
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floating zone method with radiation heating at a zone traveling rate of 3 mm/h. The compound exhibited congruent melting behavior at a liquidus temperature of about 1700 °C. The slightly Pd-depleted composition of the crystal, with respect to the nominal Gd2PdSi3 stoichiometry, led to gradual accumulation of Pd in the traveling zone and to a decreasing operating temperature during the growth process......
Effect of pulsed current micro plasma arc welding process parameters on fusion zone grain size and ultimate tensile strength of Inconel 625 sheetsChalamalasetti Srinivasa Rao22. Department... welding parameters on fusion zone grain size and ultimate tensile strength of Inconel 625 weld joints.关键词:......
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Al-Mg-Si合金GP区的键络结构与界面能分析王庆松1,郑发农1,王兴林1,沈洋1,江安1(1.安徽省芜湖市安徽工程大学 数理学院)摘 要:运用固体与分子经验电子理论,计算Al-Mg-Si合金L10型GP区的价电子结构,运用硬球模型,对该体系的GP区(L10型)与基体之间的界面能进行预测.计算结果表明,GP区具有较强的共价键络,是该合金时效硬化的主要原因.GP区中Mg-Mg原子之间的结合倾向最大,是时效初期GP区形成片状的内在原因.GP区随时效温度升高而键强减弱,从而热稳定性降低.GP区与基体的共格界面能比基......
焊接热循环对07MnCrMoVR钢热影响区组织及韧性的影响许良红1,陈延清1,章军1,曾宇波2,王剑2(1.北京市首钢技术研究院用户技术研究所2.中国水电八局制安分局,湖南长沙 410007)摘 要:为深入分析07MnCrMoVR钢热影响区的脆化问题,采用热模拟技术和显微观察技术,对该钢热影响区的组织和性能进行了深入研究.研究结果表明:单次热循环时,粗晶区(CGHAZ)和临界区(ICHAZ)韧性恶化严重,晶粒长大及粒状贝氏体,M-A组元等非平衡组织的形成是粗晶区韧性恶化的主要原因.随着t8/5的增加,粗晶区冲击......
by electron beam physical vapor deposition.Inter-diffusion behavior between coatings and substrates at 1100℃ and its effects on microstructure stability of the substrates were investigated.A 3-μm-thick substrate diffusion zone(SDZ) layer forms beneath the coating/substrate interface after 5-h heat treatment.The SDZ layer is composed of γ’-Ni3 Al phases and needle-like precipitates growing along(100)(110......
Fe2O3 and Fe3O4. Beneath the external scale of the nodules, there is an internal oxidation zone where iron oxide is mixed with copper metal. Furthermore, the base of the internal oxidation zone is characterized by a discontinuous aluminum-enriched layer of either Al2O3 or FeAl2O4. For the stratified scales, no internal oxidation zone is present beneath the innermost Al2O3 or FeAl2O4 layer......