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首页> 外文期刊>Philosophical Magazine, A. Physics of condensed matter, defects and mechanical properties >Correlation of microstructure and mechanical properties with ultrasonic velocity in the Ni-based superalloy Inconel 625
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Correlation of microstructure and mechanical properties with ultrasonic velocity in the Ni-based superalloy Inconel 625

机译：镍基高温合金Inconel 625的组织和力学性能与超声速度的关系

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Inconel 625 tubes are used extensively in ammonia cracker units of heavy-water plants. During service, the alloy is exposed to temperature close to 873 K for a prolonged period (about 60 000 h), leading to substantial decrease in ductility and toughness of the alloy due to heavy intragranular and intergranular precipitation. Service-exposed Inconel 625 material (873 K for about 60 000 h) was given post-service ageing treatments at different temperatures (923, 1023 and 1123 K) up to 500 h. These heat treatments altered the microstructure, which in turn had an influence upon both the tensile properties and the ultrasonic velocity. The alloy that had seen service was solution annealed at 1423 K for 0.5 h followed by ageing at different temperatures (923 and 1123 K) and the influence of these heat treatments on changes in microstructures and in turn their effect on room-temperature tensile properties and ultrasonic velocity have been studied. The present study aims at establishing the correlation between room-temperature tensile properties and ultrasonic velocity with the microstructural changes that occurred during ageing treatments in Ni-based superalloy Inconel 625. For the first time, the present authors have demonstrated the influence of various precipitates, such as intermetallic phases gamma", Ni-2(Cr, Mo) and delta, and grain-boundary carbides, on the correlation of yield strength and ultrasonic velocity. [References: 20]
机译：Inconel 625管广泛用于重水厂的氨裂化装置中。在使用过程中，合金会长时间（约60 000 h）暴露在接近873 K的温度下，由于大量的晶内和晶间析出，导致合金的延展性和韧性大大降低。对服务暴露的Inconel 625材料（873 K，约60 000 h）进行了不同温度（923、1023和1123 K）的长达500 h的服务后老化处理。这些热处理改变了微观结构，进而影响了拉伸性能和超声波速度。将已使用过的合金在1423 K下固溶退火0.5 h，然后在不同的温度（923和1123 K）下进行时效处理，这些热处理对组织变化的影响以及它们对室温拉伸性能和已经研究了超声波速度。本研究旨在建立镍基高温合金Inconel 625时效处理过程中发生的显微组织变化与室温拉伸性能和超声速度之间的相关性。作者首次证明了各种沉淀物的影响，例如金属间相γ“，Ni-2（Cr，Mo）和δ，以及晶界碳化物，与屈服强度和超声速度的关系有关。[参考文献：20]

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