Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc

This work studies the role of AISI304 stainless steel as a Co replacement binder for WC-based hardmetals. WC-AISI304 hardmetal powders were produced from raw powders (WC and AISI304) by mechanical alloying technique. The hardmetal powders were then sintered by two sintering methods; vacuum sintering...

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Main Author:	Tran , Bao Trung
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TN Mining Engineering Metallurgy
Online Access:	http://eprints.usm.my/41137/1/TRAN_BAO_TRUNG_24_Pages.pdf
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spelling	my-usm-ep.411372018-07-23T08:46:59Z Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc 2013 Tran , Bao Trung TN Mining Engineering. Metallurgy This work studies the role of AISI304 stainless steel as a Co replacement binder for WC-based hardmetals. WC-AISI304 hardmetal powders were produced from raw powders (WC and AISI304) by mechanical alloying technique. The hardmetal powders were then sintered by two sintering methods; vacuum sintering and PHIP sintering. To improve mechanical properties of sintered samples, graphite (Cgr) and NbC were added prior to milling. The results show that -phase (Fe3W3C) formed in the sintered samples during sintering. Cgr addition has enabled to reduce the formation of -phase. As this phase was eliminated, both hardness and fracture toughness of sintered sample were improved. WC grain growth can be inhibited by the addition of NbC. Increasing NbC content led to an increase of hardness but reduce fracture toughness of sintered samples. Besides that, this work also show a higher potential of PHIP in generating higher density of sintered samples compared to vacuum sintering, and hence, improving mechanical properties of WC-AISI304 hardmetals. The Vickers hardness of WC-10AISI304-2Cgr-xNbC (x = 1 - 5) hardmetals produced is in range of 1600 to1660 kg/mm2 and fracture toughness, KIC, from 8.7 to 8.3 MPa.m1/2 by vacuum sintering. However, the same samples produced via PHIP sintering gave the Vickers hardness from 1640 to 1820 kg/mm2 and fracture toughness, KIC, from 10 to 7.3 MPa.m1/2. These values of hardness and fracture toughness are in the intermediate range compared to other systems provided by literatures. The results indicate that AISI304 could be proposed to replace Co binder in order to fabricate cutting inserts. 2013 Thesis http://eprints.usm.my/41137/ http://eprints.usm.my/41137/1/TRAN_BAO_TRUNG_24_Pages.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	TN Mining Engineering Metallurgy
spellingShingle	TN Mining Engineering Metallurgy Tran , Bao Trung Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc
description	This work studies the role of AISI304 stainless steel as a Co replacement binder for WC-based hardmetals. WC-AISI304 hardmetal powders were produced from raw powders (WC and AISI304) by mechanical alloying technique. The hardmetal powders were then sintered by two sintering methods; vacuum sintering and PHIP sintering. To improve mechanical properties of sintered samples, graphite (Cgr) and NbC were added prior to milling. The results show that -phase (Fe3W3C) formed in the sintered samples during sintering. Cgr addition has enabled to reduce the formation of -phase. As this phase was eliminated, both hardness and fracture toughness of sintered sample were improved. WC grain growth can be inhibited by the addition of NbC. Increasing NbC content led to an increase of hardness but reduce fracture toughness of sintered samples. Besides that, this work also show a higher potential of PHIP in generating higher density of sintered samples compared to vacuum sintering, and hence, improving mechanical properties of WC-AISI304 hardmetals. The Vickers hardness of WC-10AISI304-2Cgr-xNbC (x = 1 - 5) hardmetals produced is in range of 1600 to1660 kg/mm2 and fracture toughness, KIC, from 8.7 to 8.3 MPa.m1/2 by vacuum sintering. However, the same samples produced via PHIP sintering gave the Vickers hardness from 1640 to 1820 kg/mm2 and fracture toughness, KIC, from 10 to 7.3 MPa.m1/2. These values of hardness and fracture toughness are in the intermediate range compared to other systems provided by literatures. The results indicate that AISI304 could be proposed to replace Co binder in order to fabricate cutting inserts.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Tran , Bao Trung
author_facet	Tran , Bao Trung
author_sort	Tran , Bao Trung
title	Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc
title_short	Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc
title_full	Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc
title_fullStr	Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc
title_full_unstemmed	Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc
title_sort	effect of graphite and nbc on mechanical properties of aisi304 binded wc
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral
publishDate	2013
url	http://eprints.usm.my/41137/1/TRAN_BAO_TRUNG_24_Pages.pdf
_version_	1747820881198972928

Effect Of Graphite And Nbc On Mechanical Properties Of Aisi304 Binded Wc

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