Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate

In this paper, two types of grain refining alloys, Al-3Ti-0.15C and Al-5Ti-0.2B, were used to cast two types of 7050 rolling ingots. The effect of Al-3Ti-0.15C and Al-5Ti-0.2B grain refiners on fracture toughness in different directions for 7050 ingots after heat treatment and 7050-T7651 plates was...

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Autores principales:	Fang Yu, Xiangjie Wang, Tongjian Huang, Daiyi Chao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Al-5Ti-0.2B Al-3Ti-0.15C 7050 ingot 7050-T7651 plate fracture toughness grain size Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/988ed45d607a461b9b2ef9a8c1ac5fcf
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spelling	oai:doaj.org-article:988ed45d607a461b9b2ef9a8c1ac5fcf2021-11-11T18:12:14ZEffect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate10.3390/ma142167051996-1944https://doaj.org/article/988ed45d607a461b9b2ef9a8c1ac5fcf2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6705https://doaj.org/toc/1996-1944In this paper, two types of grain refining alloys, Al-3Ti-0.15C and Al-5Ti-0.2B, were used to cast two types of 7050 rolling ingots. The effect of Al-3Ti-0.15C and Al-5Ti-0.2B grain refiners on fracture toughness in different directions for 7050 ingots after heat treatment and 7050-T7651 plates was investigated using optical electron microscopy (OEM) and scanning electron microscopy (SEM). Mechanical properties testing included both tensile and plane strain fracture toughness (K<sub>IC</sub>). The grain size was measured from the surface to the center of the 7050 ingots with two different grain refiners. The fracture surface was analyzed by SEM and energy dispersive spectrometer (EDS). The experiments showed the grain size from edge to center was reduced in 7050 ingots with both the TiC and TiB refiners, and the grain size was larger for ingots with the Al-3Ti-0.15C grain refiner at the same position. The tensile properties of 7050 ingots after heat treatment with Al-3Ti-0.15C grain refiner were 1–2 MPa lower than the ingot with the Al-5Ti-0.2B grain refiner. For the 7050-T7651 100 mm thick plate with the Al-3Ti-0.15C grain refiner, for the L direction, the tensile properties were lower by about 10~15 MPa; for the plate with the Al-3Ti-0.15C refiner than plate with Al-5Ti-0.2B refiner, for the LT direction, the tensile properties were lower by about 13–18 MPa; and for the ST direction, they were lower by about 8–10 MPa compared to that of Al-5Ti-0.2B refiner. The fracture toughness of the 7050-T7651 plate produced using the Al-3Ti-0.15C ingot was approximately 2–6 MPa · <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msqrt><mi>m</mi></msqrt></mrow></semantics></math></inline-formula> higher than the plate produced from the Al-5Ti-0.2B ingot. Fractography of the failed fracture toughness specimens revealed that the path of crack propagation of the 7050 ingot after heat treatment produced from the Al-3Ti-0.15C grain refiner was more tortuous than in the ingot produced from the Al-5Ti-0.2B, which resulted in higher fracture toughness.Fang YuXiangjie WangTongjian HuangDaiyi ChaoMDPI AGarticleAl-5Ti-0.2BAl-3Ti-0.15C7050 ingot7050-T7651 platefracture toughnessgrain sizeTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6705, p 6705 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Al-5Ti-0.2B Al-3Ti-0.15C 7050 ingot 7050-T7651 plate fracture toughness grain size Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	Al-5Ti-0.2B Al-3Ti-0.15C 7050 ingot 7050-T7651 plate fracture toughness grain size Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Fang Yu Xiangjie Wang Tongjian Huang Daiyi Chao Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate
description	In this paper, two types of grain refining alloys, Al-3Ti-0.15C and Al-5Ti-0.2B, were used to cast two types of 7050 rolling ingots. The effect of Al-3Ti-0.15C and Al-5Ti-0.2B grain refiners on fracture toughness in different directions for 7050 ingots after heat treatment and 7050-T7651 plates was investigated using optical electron microscopy (OEM) and scanning electron microscopy (SEM). Mechanical properties testing included both tensile and plane strain fracture toughness (K<sub>IC</sub>). The grain size was measured from the surface to the center of the 7050 ingots with two different grain refiners. The fracture surface was analyzed by SEM and energy dispersive spectrometer (EDS). The experiments showed the grain size from edge to center was reduced in 7050 ingots with both the TiC and TiB refiners, and the grain size was larger for ingots with the Al-3Ti-0.15C grain refiner at the same position. The tensile properties of 7050 ingots after heat treatment with Al-3Ti-0.15C grain refiner were 1–2 MPa lower than the ingot with the Al-5Ti-0.2B grain refiner. For the 7050-T7651 100 mm thick plate with the Al-3Ti-0.15C grain refiner, for the L direction, the tensile properties were lower by about 10~15 MPa; for the plate with the Al-3Ti-0.15C refiner than plate with Al-5Ti-0.2B refiner, for the LT direction, the tensile properties were lower by about 13–18 MPa; and for the ST direction, they were lower by about 8–10 MPa compared to that of Al-5Ti-0.2B refiner. The fracture toughness of the 7050-T7651 plate produced using the Al-3Ti-0.15C ingot was approximately 2–6 MPa · <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msqrt><mi>m</mi></msqrt></mrow></semantics></math></inline-formula> higher than the plate produced from the Al-5Ti-0.2B ingot. Fractography of the failed fracture toughness specimens revealed that the path of crack propagation of the 7050 ingot after heat treatment produced from the Al-3Ti-0.15C grain refiner was more tortuous than in the ingot produced from the Al-5Ti-0.2B, which resulted in higher fracture toughness.
format	article
author	Fang Yu Xiangjie Wang Tongjian Huang Daiyi Chao
author_facet	Fang Yu Xiangjie Wang Tongjian Huang Daiyi Chao
author_sort	Fang Yu
title	Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate
title_short	Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate
title_full	Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate
title_fullStr	Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate
title_full_unstemmed	Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate
title_sort	effect of grain refiner on fracture toughness of 7050 ingot and plate
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/988ed45d607a461b9b2ef9a8c1ac5fcf
work_keys_str_mv	AT fangyu effectofgrainrefineronfracturetoughnessof7050ingotandplate AT xiangjiewang effectofgrainrefineronfracturetoughnessof7050ingotandplate AT tongjianhuang effectofgrainrefineronfracturetoughnessof7050ingotandplate AT daiyichao effectofgrainrefineronfracturetoughnessof7050ingotandplate
_version_	1718431901167910912

Effect of Grain Refiner on Fracture Toughness of 7050 Ingot and Plate

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