Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys

Sintered materials are superior in productivity because of their simple process, but their mechanical properties are low. To improve the mechanical properties of sintered materials, we focus on liquid-phase sintering. In this study, we selected boron as sintering aids and evaluated on the effect of...

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Autores principales:	Shigeki EGASHIRA, Takashi SEKIYA, Tomoyuki UENO, Masahiro FUJII
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	powder metallurgy liquid phase sintered steel boron mechanical property tensile strength Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/f4f6d63cfc2f439e83edaa44ac02181a
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spelling	oai:doaj.org-article:f4f6d63cfc2f439e83edaa44ac02181a2021-11-29T05:48:33ZEffect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys2187-974510.1299/mej.19-00297https://doaj.org/article/f4f6d63cfc2f439e83edaa44ac02181a2019-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/6/6_19-00297/_pdf/-char/enhttps://doaj.org/toc/2187-9745Sintered materials are superior in productivity because of their simple process, but their mechanical properties are low. To improve the mechanical properties of sintered materials, we focus on liquid-phase sintering. In this study, we selected boron as sintering aids and evaluated on the effect of the addition quantity of boron (0-0.6 mass%) to the mechanical properties of liquid-phase sintered and heat-treated materials. In the test range of this study, the tensile strength of material with an additional quantity of boron of 0.1 mass% showed the highest value, 1386 MPa, which is about 35% higher compared to the tensile strength of material without adding boron. On the other hand, materials with an additional quantity of boron of 0.2 mass% or higher showed higher-density than material with an additional quantity of boron of 0.1 mass%, but both their elongation and tensile strength were significantly decreased. The precipitates changed between the boundary of the quantity of boron added of 0.1 and that of 0.2 mass%. Only Fe23B6 was formed in the material with the boron addition amount of 0.1 mass% or less, and Fe23B6 and Fe2B were formed in the material with the boron addition amount of 0.2 mass% or more. By cross-sectional observation of the test specimen after the tensile test, it was confirmed that in the material with the boron addition amount of 0.2 mass% or more cracks occurred and propagated at the Fe23B6/Fe2B interface and finally resulted in fracture. In the material with the boron addition amount of 0.1 mass%, however, such a fracture was not confirmed. The phenomena could be explained the fact that the mechanical properties were sharply changed between the quantity of boron added of 0.1 mass% and 0.2 mass%. The existence of Fe23B6/Fe2B interface would significantly affect the strength of the liquid-phase sintered materials.Shigeki EGASHIRATakashi SEKIYATomoyuki UENOMasahiro FUJIIThe Japan Society of Mechanical Engineersarticlepowder metallurgyliquid phase sintered steelboronmechanical propertytensile strengthMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 6, Pp 19-00297-19-00297 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	powder metallurgy liquid phase sintered steel boron mechanical property tensile strength Mechanical engineering and machinery TJ1-1570
spellingShingle	powder metallurgy liquid phase sintered steel boron mechanical property tensile strength Mechanical engineering and machinery TJ1-1570 Shigeki EGASHIRA Takashi SEKIYA Tomoyuki UENO Masahiro FUJII Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys
description	Sintered materials are superior in productivity because of their simple process, but their mechanical properties are low. To improve the mechanical properties of sintered materials, we focus on liquid-phase sintering. In this study, we selected boron as sintering aids and evaluated on the effect of the addition quantity of boron (0-0.6 mass%) to the mechanical properties of liquid-phase sintered and heat-treated materials. In the test range of this study, the tensile strength of material with an additional quantity of boron of 0.1 mass% showed the highest value, 1386 MPa, which is about 35% higher compared to the tensile strength of material without adding boron. On the other hand, materials with an additional quantity of boron of 0.2 mass% or higher showed higher-density than material with an additional quantity of boron of 0.1 mass%, but both their elongation and tensile strength were significantly decreased. The precipitates changed between the boundary of the quantity of boron added of 0.1 and that of 0.2 mass%. Only Fe23B6 was formed in the material with the boron addition amount of 0.1 mass% or less, and Fe23B6 and Fe2B were formed in the material with the boron addition amount of 0.2 mass% or more. By cross-sectional observation of the test specimen after the tensile test, it was confirmed that in the material with the boron addition amount of 0.2 mass% or more cracks occurred and propagated at the Fe23B6/Fe2B interface and finally resulted in fracture. In the material with the boron addition amount of 0.1 mass%, however, such a fracture was not confirmed. The phenomena could be explained the fact that the mechanical properties were sharply changed between the quantity of boron added of 0.1 mass% and 0.2 mass%. The existence of Fe23B6/Fe2B interface would significantly affect the strength of the liquid-phase sintered materials.
format	article
author	Shigeki EGASHIRA Takashi SEKIYA Tomoyuki UENO Masahiro FUJII
author_facet	Shigeki EGASHIRA Takashi SEKIYA Tomoyuki UENO Masahiro FUJII
author_sort	Shigeki EGASHIRA
title	Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys
title_short	Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys
title_full	Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys
title_fullStr	Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys
title_full_unstemmed	Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys
title_sort	effect of boron addition on mechanical properties of fe-ni-mo-b-c sintered alloys
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/f4f6d63cfc2f439e83edaa44ac02181a
work_keys_str_mv	AT shigekiegashira effectofboronadditiononmechanicalpropertiesoffenimobcsinteredalloys AT takashisekiya effectofboronadditiononmechanicalpropertiesoffenimobcsinteredalloys AT tomoyukiueno effectofboronadditiononmechanicalpropertiesoffenimobcsinteredalloys AT masahirofujii effectofboronadditiononmechanicalpropertiesoffenimobcsinteredalloys
_version_	1718407623031652352

Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys

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