Precipitation Strengthening of Supersaturated Alloying Elements in Cu40Zn Graphite Brasses Prepared by Powder Metallurgy

doi:10.11901/1005.3093.2017.771

Chinese Journal of Materials Research

2018, Vol. 32

Issue (11): 843-852 DOI: 10.11901/1005.3093.2017.771

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Precipitation Strengthening of Supersaturated Alloying Elements in Cu40Zn Graphite Brasses Prepared by Powder Metallurgy

Shufeng LI^1,²(

), Imai Hisashi², Kondoh Katsuyoshi², Xin ZHANG¹, Deng PAN¹, Yabo FU³

1 School of Materials Science and Engineering, Xian University of Technology, Xian 710048, China
2 Joining and Welding Research Institute, Osaka University, Osaka 5670047, Japan
3 School of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, China

Cite this article:

Shufeng LI, Imai Hisashi, Kondoh Katsuyoshi, Xin ZHANG, Deng PAN, Yabo FU. Precipitation Strengthening of Supersaturated Alloying Elements in Cu40Zn Graphite Brasses Prepared by Powder Metallurgy. Chinese Journal of Materials Research, 2018, 32(11): 843-852.

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Abstract

Cr, Fe, Ti and Sn were added to brass matrix as trace alloying elements. The brass alloys powder prepared by water atomization process were premixed with graphite particles and consolidated at appropriate temperature. The sintered billet was hot extruded to increase the density and prepare extrusion rod for tensile test. The effects of graphite particles and alloying elements on the machinability, microstructural and mechanical properties of Cu40Zn brass were investigated in detail. It was found that the super-saturated solid solution of Cr, Fe and Ti creates a high precipitation reaction chemical potential in water atomized brass powder, which precipitated in form of nano/micro scale particles in the subsequent hot working showing superior strengthening effect. Graphite particles with appreciate content can improve machinability effectively without deteriorating the mechanical properties.

Key words: non-ferrous metal and alloy graphite brass powder metallurgy lead-free mechanical properties machinability

Received: 28 December 2017

ZTFLH:

TG146

Fund: Supported by National Natural Science Foundation of China (Nos. 51571160 & 51871180), Japan Science and Technology Agency (JST) (No. 25249102)

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	Shufeng LI
	Imai Hisashi
	Kondoh Katsuyoshi
	Xin ZHANG
	Deng PAN
	Yabo FU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.771 OR https://www.cjmr.org/EN/Y2018/V32/I11/843

Fig.1 Water cooled atomization process and schematic diagram of sample preparation process

Fig.2 Microstructure of BS40-M raw brass powder and raw material for experiment (a) Water atomized brass alloy powder; (b) Graphite powder; (c) Microstructure of as-cast brass alloy; (d) Profile microstructure of water atomized brass alloy powder profile

Fig.3 Microstructures and mechanical properties of B40-1.0Cr1.0Gr graphite brass (a) BS40-1.0Cr1.0Gr powder mixtures and its local micrograph; (b-c) SEM micrograph and EDS analysis of BS40-1.0Cr1.0Gr graphite brass prepared at different hot extrusion temperatures; (d) XRD patterns of BS40-1.0Cr1.0Gr graphite brass prepared at different hot extrusion temperatures; (e) Stress-strain curves of BS40-1.0Cr1.0Gr graphite brass prepared at different hot extrusion temperatures

Fig.4 Microstructures of BS40-1.0Ti0.6Sn brass alloy sintered and hot extruded at different temperatures (a) BS40-1.0Ti0.6Sn brass alloy sintered at 673 K, nano-precipitations are shown in arrows in the upper right-hand magnified photograph; (b) BS40-1.0Ti0.6Sn brass alloy sintered at 773 K; (c) BS40-1.0Ti0.6Sn brass alloy sintered at 873 K; (a') BS40-1.0Ti0.6Sn brass alloy sintered at 673 K and hot extrusion; (b') BS40-1.0Ti0.6Sn brass alloy sintered at 773 K and hot extrusion; (c) BS40-1.0Ti0.6Sn brass alloy sintered at 873 K and hot extrusion, the direction of extrusion is shown in the arrow in the picture

Fig.5 (a) XRD patterns of BS40-1.0Ti0.6Sn sintered at different temperature; (b) Microstructures of as-cast alloys; (c) EDS mappings of as-cast alloys

Fig.6 (a) The strain-stress curves of BS40-1.0Ti0.6Sn brass alloys sintered at different temperatures and hot extrusion; (b) The fracture morphology of the sample sintered at 673 K; (c) The fracture morphology of the sample sintered at 873 K

Fig.7 Effect of multiple alloying elements on microstructures and properties of BS40-M brass alloy (a) The strain-stress curves and mechanical properties data of as-extruded BS40-M; (b-b') SEM images, TEM images and the corresponding SAED of as-extruded BS40-0.2Cr0.2Fe0.6Sn; (c-c') SEM images, TEM images and the corresponding SAED of as-extruded BS40-0.7Cr0.3Fe0.6Sn1.0Ti

Fig.8 The mechanical property and machinability of BS40-M graphite brass (a) Tensile properties of BS40-M graphite brass; (a') Microstructure of the fracture of BS40-M; (a'') Image of forging and deforming BS40-M; (b) Image of traditional leaded brass cutting chip; (c) Image of BS40-M graphite brass cutting chip; (c') SEM images and the corresponding EDS mappings of BS40-M graphite brass cutting chip

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