The Mechanism of Grain Boundary Serration and Fan-Type Structure Formation in Ni-Based Superalloys

被引：20

作者：

Atrazhev, V. V. ^{[1
,2
]}

Burlatsky, S. F. ^{[3
]}

Dmitriev, D., V ^{[1
,2
]}

Furrer, D. ^{[4
]}

Kuzminyh, N. Y. ^{[1
,2
]}

Lomaev, I. L. ^{[1
,5
]}

Novikov, D. L. ^{[3
]}

Stolz, S. ^{[4
]}

Reynolds, P. ^{[4
]}

机构：

[1] Sci Technol LLC, Leninskiy Pr T 95, Moscow 119313, Russia

[2] Inst Biochem Phys RAS, Kosygin Str 4, Moscow 119334, Russia

[3] United Technol Res Ctr, 411 Silver Lane, E Hartford, CT 06108 USA

[4] Pratt & Whitney, 400 Main St, E Hartford, CT 06108 USA

[5] MN Mikheev Inst Met Phys RAS, S Kovalevskoy St 18, Ekaterinburg 620108, Russia

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2020年 / 51卷 / 07期

关键词：

SPINODAL DECOMPOSITION; DISCONTINUOUS PRECIPITATION; GROWTH; PHASE; MODEL;

D O I：

10.1007/s11661-020-05790-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A model of discontinuous precipitation of gamma ' phase at grain boundaries (GBs) in polycrystalline Ni-based superalloys during continuous cooling from supersolvus temperature was developed. The model calculates the size and gamma ' phase fraction in GB precipitates as a function of cooling rate and GB mobility. The model is based on the classical mechanism of diffusion-controlled precipitation. It considers fast diffusion of gamma '-forming elements along the GB and the motion of the GBs under driving force induced by alloy decomposition. The model predicts either discrete GB gamma-prime particles and GB serration or the growth of fan-type structures depending on the cooling rate and GB mobility. We conclude from the model predictions that the GB mobility is the key factor controlling the type and morphology of GB precipitates. High GB mobility results in formation of fan-type structures, while the lower GB mobility leads to GB serration. The predicted dependence of the size of GB precipitates on the cooling rate is in good agreement with the experimental observations.

引用

页码：3648 / 3657

页数：10

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