Thermal and microstructural characterization of a novel ductile cast iron modified by aluminum addition

被引:0
作者
Gülşah Aktaş Çelik
Maria-Ioanna T. Tzini
Şeyda Polat
Ş. Hakan Atapek
Gregory N. Haidemenopoulos
机构
[1] Kocaeli University,Department of Metallurgical and Materials Engineering
[2] University of Thessaly,Laboratory of Materials, Department of Mechanical Engineering
[3] Khalifa University of Science and Technology,Department of Mechanical Engineering
来源
International Journal of Minerals, Metallurgy and Materials | 2020年 / 27卷
关键词
ductile cast iron; alloy design; Thermo-Calc; high-temperature material;
D O I
暂无
中图分类号
学科分类号
摘要
In high-temperature applications, like exhaust manifolds, cast irons with a ferritic matrix are mostly used. However, the increasing demand for higher-temperature applications has led manufacturers to use additional expensive materials such as stainless steels and Ni-resist austenitic ductile cast irons. Thus, in order to meet the demand while using low-cost materials, new alloys with improved high-temperature strength and oxidation resistance must be developed. In this study, thermodynamic calculations with Thermo-Calc software were applied to study a novel ductile cast iron with a composition of 3.5wt% C, 4wt% Si, 1wt% Nb, 0–4wt% Al. The designed compositions were cast, and thermal analysis and microstructural characterization were performed to validate the calculations. The lowest critical temperature of austenite to pearlite eutectoid transformation, i.e., A1, was calculated, and the solidification sequence was determined. Both calculations and experimental data revealed the importance of aluminum addition, as the A1 increased by increasing the aluminum content in the alloys, indicating the possibility of utilizing the alloys at higher temperature. The experimental data validated the transformation temperature during solidification and at the solid state and confirmed the equilibrium phases at room temperature as ferrite, graphite, and MC-type carbides.
引用
收藏
页码:190 / 199
页数:9
相关论文
共 142 条
[11]  
Åberg LM(2018)Effects of W on creep behaviors of novel Nb-bearing high nitrogen austenitic heat-resistant cast steels at 1000°C Mater. Charact. 139 19-undefined
[12]  
Hartung C(2014)Long-term oxidation of candidate cast iron and stainless steel exhaust system alloys from 650 to 800°C in air with water vapor Oxid. Met. 82 359-undefined
[13]  
Shingledecker JP(2017)Bending overload and thermal fatigue fractures in a cast exhaust manifold Eng. Fail. Anal. 82 138-undefined
[14]  
Maziasz PJ(2011)Effects of carbon equilavent on the microstructures of thin wall ductile iron J. Mater. Sci. Eng. 5 266-undefined
[15]  
Evans ND(2004)Oxidation behaviur of Al-alloyed ductile cast irons at elevated temperature Surf. Interface Anal. 36 1011-undefined
[16]  
Pollard MJ(2013)Comparison of microstructural and tribological effects of low vanadium-low titanium additions to a gray cast iron J. Mater. Eng. Perform. 22 267-undefined
[17]  
Ibrahim MM(2014)Mechanical and microstructural characterization of nodular cast iron (NCI) with niobium additions Mater. Res. 17 1167-undefined
[18]  
Nofal A(2012)Effect of tungsten on microstructure and properties of high chromium cast iron Mater. Des. 39 303-undefined
[19]  
Mourad MM(2014)Experimental characterization of Si-Mo-Cr ductile cast iron Mater. Des. 57 528-undefined
[20]  
Zhang YH(2003)Effect of niobium in medium alloyed ductile cast irons Int. J. Cast Met. Res. 16 481-undefined