The effect of aging treatment on the fracture toughness and impact strength of injection molded Ni-625 superalloy parts

被引：49
作者：
Ozgun, Ozgur [1 ]
Yilmaz, Ramazan [2 ]
Gulsoy, H. Ozkan [3 ,4 ]
Findik, Fehim [2 ]
机构：
[1] Bingol Univ, Fac Engn & Architecture, Dept Mech Engn, TR-12000 Bingol, Turkey
[2] Sakarya Univ, Fac Technol, Met & Mat Engn Dept, TR-54187 Sakarya, Turkey
[3] Marmara Univ, Fac Technol, Met & Mat Engn Dept, TR-34722 Istanbul, Turkey
[4] Marmara Univ, Nanotechnol & Biomat Appl & Res Ctr, TR-34722 Istanbul, Turkey
来源：
MATERIALS CHARACTERIZATION | 2015年 / 108卷
关键词：
Ni-based superalloy; Aging; Fracture toughness; Impact toughness; Carbides; Intermetallic phases; MECHANICAL-PROPERTIES; SINTERED STEEL; MICROSTRUCTURE; FATIGUE;
D O I：
10.1016/j.matchar.2015.08.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the effect of aging heat treatment on fracture toughness and impact strength of Ni-625 superalloy fabricated by using powder injection molding (PIM) method was examined. After a feedstock was prepared by mixing the prealloyed Ni-625 superalloy powder, which was fabricated by gas atomisation, with a polymeric binder system and then it was granulated, it was shaped through the use of injection. The molded specimens were sintered at 1300 degrees C for 3 h after a two-stage debinding process. Once the sintered specimens were treated in the solution at 1150 degrees C for 2 h, they were quenched. Aging treatment was performed by keeping specimens at 745 degrees C for 22 h. Fracture toughness and impact tests were performed on sintered and aged specimens. Microstructure examinations were performed by using optical microscope, scanning electron microscope, and transmission electron microscope. The results revealed that aging heat treatment led to the formation of some carbides and intermetallic phases in the microstructure. While the hardness of the aged specimens increased due to these phases, their fracture toughness and impact strength values decreased. (C) 2015 Elsevier Inc. All rights reserved.
引用
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页码：8 / 15
页数：8
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