Effects of heat treatment on microstructure and creep properties of a laser powder bed fused nickel superalloy

被引：43

作者：

Davies, S. J. ^{[1
]}

Jeffs, S. P. ^{[1
]}

Coleman, M. P. ^{[1
]}

Lancaster, R. J. ^{[1
]}

机构：

[1] Swansea Univ, Coll Engn, Inst Struct Mat, Bay Campus, Swansea SA1 8EN, W Glam, Wales

来源：

MATERIALS & DESIGN | 2018年 / 159卷

基金：

英国工程与自然科学研究理事会;

关键词：

Creep; EBSD; Grain boundary connectivity; Laser deposition; Small punch test; Wilshire equations; GRAIN-BOUNDARY NETWORK; BASE SUPERALLOY; MECHANICAL-PROPERTIES; EVOLUTION; DEFORMATION; MODEL;

D O I：

10.1016/j.matdes.2018.08.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nickel-based superalloy C263 has been consolidated with Laser Powder Bed Fusion (LPBF) with two perpendicular build orientations and exposed to either of two heat treatment programmes. This study analyses the effects of build orientation and heat treatment on the resulting microstructures produced in LPBF C263 variants, evaluated against a cast equivalent. Results show that although a strongly anisotropic microstructure was present in standard heat-treated (HT1) LPBF material, this was eradicated following an alternate heat treatment regime (HT2) through recrystallisation, aided by high local strain. Subsequently, their mechanical properties have been assessed by means of the Small Punch (SP) creep test. A contrasting presence of Sigma 3 formations was observed between the two LPBF heat treatment programmes with the resulting random grain boundary network (RGBN) revealing shorter potential intergranular crack paths in the HT2 material, although grain boundary carbides were found to be the dominant strengthening mechanism for improved creep resistance. Adapted Wilshire equations have been implemented to predict the long-term creep lives of the C263 variants and their apparent activation energies have been determined. (C) 2018 The Authors. Published by Elsevier Ltd.

引用

页码：39 / 46

页数：8

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