Beyond Ni-based superalloys: Development of CoRe-based alloys for gas turbine applications at very high temperatures
Beyond Ni-based superalloys: Development of CoRe-based alloys for gas turbine applications at very high temperatures
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DOI：
10.3139/146.110563
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发表时间：
2011-09-01
影响因子：
0.8
通讯作者：
Piegert, Sebastian
中科院分区：
文献类型：
--
作者：
Mukherji, Debashis;Roesler, Joachim;Piegert, Sebastian
高温材料的发展主要是由燃气轮机的需求驱动的。今天，镍基高温合金是涡轮机热区的主导材料类别。材料的发展将继续推动镍高温合金的最高使用温度上升。然而，这种方法有一个基本的限制，不能无限期地持续下去，因为镍高温合金的使用已经非常接近其熔点。在DFG Forschergruppe计划(适用于727)-“超越镍基高温合金”的框架内，布伦斯韦格工业大学正在开发芯基合金，作为可在+100℃以上使用单晶镍高温合金的新一代高温材料。在核心合金的开发中，正在探索两种主要的强化概念，即MC碳化物的沉淀强化和Co2Re3型相的复合强化。给出了显微结构表征的精选结果，包括同步加速器和中子散射的原位测量。
High temperature material development is mainly driven by gas turbine needs. Today, Ni-based superalloys are the dominant material class in the hot section of turbines. Material development will continue to push the maximum service temperature of Ni-superalloys upwards. However, this approach has a fundamental limit and cannot be sustained indefinitely, as the Ni-superalloys are already used very close to their melting point. Within the framework of a DFG Forschergruppe program (FOR 727) - "Beyond Ni-base Superalloys" - CoRe based alloys are being developed at the Technische Universitat Braunschweig as a new generation of high temperature materials that can be used at + 100 degrees C above single crystal Ni-superalloys. Two main strengthening concepts, namely precipitation hardening by MC carbides and composite hardening by Co2Re3-type phase are being explored in CoRe alloy development. Selected results of microstructural characterizations, including in-situ measurements by synchrotron and neutron scattering are presented.