On the microstructural and mechanical properties of post-treated additively manufactured Inconel 718 superalloy under quasi-static and cyclic loading

被引:205
作者
Aydinoez, M. E. [1 ,2 ]
Brenne, F. [1 ,2 ]
Schaper, M. [1 ,2 ]
Schaak, C. [3 ]
Tillmann, W. [3 ]
Nellesen, J. [4 ]
Niendorf, T. [5 ]
机构
[1] Univ Paderborn, Lehrstuhl Werkstoffkunde Mat Sci, D-33098 Paderborn, Germany
[2] DMRC, D-33098 Paderborn, Germany
[3] TU Dortmund, Inst Mat Engn, D-44227 Dortmund, Germany
[4] RIF eV, Inst Forsch & Transfer, D-44227 Dortmund, Germany
[5] Univ Kassel, Inst Mat Engn, D-34125 Kassel, Germany
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 669卷
关键词
Additive manufacturing; Selective laser melting; Nickel-based alloy; Microstructure; Fatigue; CRACK GROWTH-BEHAVIOR; HEAT-TREATMENT; DEFORMATION-BEHAVIOR; FATIGUE BEHAVIOR; TURBINE DISC; LASER; TEMPERATURE; STEEL; PRECIPITATION; POWDER;
D O I
10.1016/j.msea.2016.05.089
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Inconel 718 specimens were additively manufactured via selective laser melting (SLM) and subjected to different post-process heat treatments. Performance under monotonic and cyclic loading in the low-cycle fatigue (LCF) regime was investigated at room temperature (RT). Hot isostatic pressing (HIP) was employed in order to reduce the porosity typically present after SLM. Prior functional encapsulation with a Ni-20Cr coating applied by cathodic arc deposition (Arc-PVD) was applied to achieve full densification. The results show that after Arc-PVD and HIP, the mechanical properties are not only affected by reduced porosity but also by substantial microstructural changes. Precipitates, i.e. Laves phase, already present in the as-built condition can be dissolved by solution heat treatment. HIP leads to recrystallization and thus significantly changes microstructural appearance. Elongated grains and sub-micron sized cell structures stemming from SLM processing are eliminated by HIP. Aging leads to evolution of strengthening gamma '' precipitates. Concurrently, delta phase forms upon HIP and aging. In comparison to aged conditions that were not subjected to HIP, microstructure upon HIP and aging results in improved ductility under monotonic loading, however, concomitantly deteriorates fatigue properties at RT. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:246 / 258
页数:13
相关论文
共 51 条
[1]   Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting [J].
Amato, K. N. ;
Gaytan, S. M. ;
Murr, L. E. ;
Martinez, E. ;
Shindo, P. W. ;
Hernandez, J. ;
Collins, S. ;
Medina, F. .
ACTA MATERIALIA, 2012, 60 (05) :2229-2239
[2]   Delta phase precipitation in Inconel 718 [J].
Azadian, S ;
Wei, LY ;
Warren, R .
MATERIALS CHARACTERIZATION, 2004, 53 (01) :7-16
[3]  
Brooks J. W., 1988, SUPERALLOYS, V88, P33
[4]   Effect of heat treatment on the microstructure and mechanical properties of Inconel 718 processed by selective laser melting [J].
Chlebus, E. ;
Gruber, K. ;
Kuznicka, B. ;
Kurzac, J. ;
Kurzynowski, T. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2015, 639 :647-655
[5]   Shaped metal deposition of a nickel alloy for aero engine applications [J].
Clark, D. ;
Bache, M. R. ;
Whittaker, M. T. .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2008, 203 (1-3) :439-448
[6]   FREQUENCY AND WAVE-FORM EFFECTS ON FATIGUE CRACK GROWTH-BEHAVIOR OF ALLOY 718 AT 298-K AND 823-K [J].
CLAVEL, M ;
PINEAU, A .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1978, 9 (04) :471-480
[7]   Producing metal parts with selective laser sintering hot isostatic pressing [J].
Das, S ;
Wohlert, M ;
Beaman, JJ ;
Bourell, DL .
JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY, 1998, 50 (12) :17-20
[8]  
Desvallees Y., 1994, MET MAT SOC, P281
[9]  
Downing M., 1993, THESIS
[10]   KINETICS OF GRAIN GROWTH IN 718 Ni-BASE SUPERALLOY [J].
Huda, Z. ;
Zaharinie, T. ;
Metselaar, I. H. S. C. ;
Ibrahim, S. ;
Min, Goh J. .
ARCHIVES OF METALLURGY AND MATERIALS, 2014, 59 (03) :847-852