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Powder Metallurgy Progress
Journal of Science and Technology of Particle Materials
Open access
Sintered Structural Steels Containing Mn, Cr And Mo – The Summary of the Investigations

., vol. 1, 2007, no, 52, p. 97 [42] Sulowski, M.: Arch. Metall. Mater., vol. 52, 2007, no. 4, p. 617 [43] Sułowski, M., Faryj, K.: Arch. Metall. Mater., vol. 54, 2009, no. 1, p. 121 [44] Ciaś, A., Sułowski, M.: Arch. Metall. Mater., vol. 54, 2009, no. 4, p. 1093 [45] Ciaś, A.: Development and Properties of Fe-Mn-(Mo)-(Cr)-C Sintered Structural Steels. Krakow : AGH - Uczelniane Wydawnictwa Naukowo-Dydaktyczne, 2004 [46] Sułowski, M., Ciaś, A.: Arch. Metall. Mater., vol. 56, 2011, no. 2, p

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Mechanical Properties of Copper Processed by Equal Channel Angular Pressing

Abstract

The development of the nanostructure in commercial pure copper and the strength and ductility after severe plastic deformation (SPD) with the technology of equal channel angular pressing (ECAP) are analysed. Experimental results and analyses showed that both strength and ductility can be increased simultaneously by SPD. The final grain size decreased from the initial 50μm by SPD to 100-300 nm after 10 passes. An increase of the ductility together with an increase of strength caused by SPD are explained by a strong grain refinement and by a dynamic equilibrium of weakening and strengthening, and it is visible on the final static tensile test stress-strain charts.

Open access
The Effect of Transient Liquid Phase on the Joining Process of Aluminum Foam Core Sandwiches

Abstract

Despite recent developments in sandwich panels production technology, there are some difficulties in joining core sandwiches. Liquid Phase Sintering is a conventional method to increase the density of powder metallurgy parts. In this paper, we applied LPS as a joining process between Al-foam and Al-metal by using Al-mixture powders with different compositions as the interlayer. At first stage, Al-Zn powder mixture was used and the possibility of this process was investigated. At later stages, we tried to increase the joint bonding strength with different Al-mixture powder compositions. 3-point bending test was applied and by using mathematical relations, bonding strengths were calculated. The highest bonding strength was obtained, about 9 kPa, when Al-Zn-Mg was used as the interlayer. Also energy dispersive spectrometry (EDS) was used to investigate the diffusion of additive elemental powders to Al-mixture powders.

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Effect of Alloying Type and Lean Sintering Atmosphere on the Performance of PM Components

Abstract

In order to be cost effective and to meet increasing performance demands, powder metallurgy steel components require continuous improvement in terms of materials and process development. This study demonstrates the feasibility of manufacturing structural components using two different alloys systems, i.e. lean Cr-prealloyed and diffusion bonded water atomised powders with different processing conditions. The components were sintered at two different temperatures, i.e. 1120 and 1250 °C for 30 minutes in three different atmospheres: vacuum, N2- 10%H2 atmosphere as well as lean N2-5%H2-0.5%CO-(0.1-0.4)%CH4 sintering atmosphere. Components after sintering were further processed by either low pressure carburizing, sinterhardening or case hardening. All trials were performed in the industrial furnaces to simulate the actual production of the components. Microstructure, fractography, apparent and micro hardness analyses were performed close to the surface and in the middle of the sample to characterize the degree of sintering (temperature and atmosphere) and the effect of heat treatment. In all cases, components possess mostly martensitic microstructure with a few bainitic regions. The fracture surface shows well developed sinter necks. Inter- and trans-granular ductile and cleavage fracture modes are dominant and their fraction is determined by the alloy and processing route.

Open access
New Chances for the Masteralloy Approach

REFERENCES [1] Zapf, G., Dalal, K.: Modern developments in powder metallurgy, 1977, p. 129 [2] Schlieper, G., Thümmler, F.: Powder Metallurgy International, vol. 11, 1979, p. 172 [3] Banerjee, S., et al.: Progress in Powder Metallurgy, vol. 13, 1980, p. 143 [4] Fischmeister, HF., Larsson, LE.: Powder Metallurgy, vol. 17, 1974, p. 227 [5] Mocarski, S., et al.: Powder Metallurgy, vol. 39, 1996, p. 130 [6] Klein, AN., Oberacker, R., Thummler, F.: Modern Developments in Powder Metallurgy, vol. 16, 1985, p. 141 [7] Danninger

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Density, Microstructure, Strength and Fractography of Spark Plasma and Conventionally Sintered Mn Steels

., Zhang, J.: Journal of American Ceramic Society, vol. 89, 2006, no. 2, p. 494 [7] Zhaohui, Z., Fuchi, W., Lin, W.: Materials Letters, vol. 62, 2008, no. 24, p. 3987 [8] Hebda, M.: Czasopismo Techniczne, z. 11, Mechanika, z. 6-M, 2012, no. 11, p. 47 [9] Cias, A.: Development and Properties of Fe-Mn-(Mo)-(Cr)-C Sintered Structural Steels. AGH – Uczelniane Wydawnictwa Naukowo-Dydaktyczne, 2004 [10] Dudrova, E., Kabatova, M. In: Fractography – Principles and Application, Workshop. March 23–25, 2015, Košice, Slovakia

Open access
The Effects of Post-Sintering Treatments on Microstructure and Mechanical Properties of Mn-Mo Steel

, M., Girardini, L., Molinari, A.: Powder Metallurgy, vol. 51, 2008, no. 3, p. 237 [7] Ciaś, A.: Development and Properties of Fe-Mn-(Mo)-(Cr)-C Sintered Structural Steels. Kraków : AGH - Uczelniane Wydawnictwo Naukowo-Dydaktyczne, 2004 [8] Ciaś, A., Stoytchev, M.: Archives of Metallurgy and Materials, vol. 62, 2017, no. 1, p. 11 [9] Ciaś, A.: International Journal of Materials Research, vol. 106, 2015, no. 5, p. 495 [10] Ciaś, A.: Kovové Materiály, vol. 54, 2016, no. 4, p. 269 [11] Ciaś, A.: Powder Metallurgy, vol. 56, 2014, no. 3, p

Open access
The Structure and Mechanical Properties of Ni-Mo PM Steels with Addition of Mn And Cu

REFERENCES [1] Lichańska, E., Sułowski, M., Ciaś, A.: Arch. Metall. Mater., vol. 61, 2016, no. 1, p. 109 [2] Lindsley, B., Rutz, H.: Adv. Powder Metall. Part. Mater., 2008, p. 9 [3] Danninger, H., Pöttschacher, R., Bradac, S., Šalak, A., Seyrkammer, J.: Powder Metall., vol. 48, 2005, no. 1, p. 23 [4] Danninger, H.: Powder Metall. Int., vol. 24, 1992, p. 73 [5] Danninger, H.: Powder Metall. Int., vol. 24, 1992, p. 163 [6] Missol, W.: Spiekane części maszyn, 1972 [7] Ciaś, A.: Development and Properties of Fe

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