TY - GEN

T1 - Investigation of a sinterforging process for radially particle reinforced sintered MMC-components

AU - Behrens, Bernd Arno

AU - Malik, Irfan Yousaf

AU - Ross, Ingo

N1 - Funding information: The results presented are based on the framework of the research project “Hot Forging of partially particle-reinforced sintered components” under the project number 283970253. The authors would like to thank the German Research Foundation (DFG) for financial support.

PY - 2019

Y1 - 2019

N2 - The ever-increasing demand for weight reduction of manufactured parts is leading to the replacement of steel with light metals such as aluminum and magnesium. However, light metals are at times unable to withstand high tribological, thermal or mechanical loads. This leads to an application of metal-matrix-composites (MMC) that possess the advantages of light metals (low weight and high ductility), as well as the characteristics of the reinforcing phase (high hardness, high strength and good wear resistance). To manufacture the MMC components, metal powders were shaped in a pressing process and further densified during a subsequent sintering phase. The residual porosity within the produced parts can be reduced by means of a subsequent sinterforging operation. In this paper, cylindrical partially particle-reinforced specimens, with a radially layered structure, were manufactured by two-sided powder pressing and sintering. A subsequent forging operation was carried out to eliminate the minimal porosity. Different process parameters (forming temperature, true strain and dilation rate) were varied to investigate their effects on the density and structural bonding of the partially particle-reinforced material system. Therefore, the sinterforging process upsetting was carried out. Subsequently, the particle-reinforced parts were characterised by metallographic analysis and hardness measurements. The results show that cracks and defects in the layer system of partially particle-reinforced powder compacts can be repaired using sinter forging.

AB - The ever-increasing demand for weight reduction of manufactured parts is leading to the replacement of steel with light metals such as aluminum and magnesium. However, light metals are at times unable to withstand high tribological, thermal or mechanical loads. This leads to an application of metal-matrix-composites (MMC) that possess the advantages of light metals (low weight and high ductility), as well as the characteristics of the reinforcing phase (high hardness, high strength and good wear resistance). To manufacture the MMC components, metal powders were shaped in a pressing process and further densified during a subsequent sintering phase. The residual porosity within the produced parts can be reduced by means of a subsequent sinterforging operation. In this paper, cylindrical partially particle-reinforced specimens, with a radially layered structure, were manufactured by two-sided powder pressing and sintering. A subsequent forging operation was carried out to eliminate the minimal porosity. Different process parameters (forming temperature, true strain and dilation rate) were varied to investigate their effects on the density and structural bonding of the partially particle-reinforced material system. Therefore, the sinterforging process upsetting was carried out. Subsequently, the particle-reinforced parts were characterised by metallographic analysis and hardness measurements. The results show that cracks and defects in the layer system of partially particle-reinforced powder compacts can be repaired using sinter forging.

KW - Aluminum

KW - Metal-matrix-composites

KW - Powder metallurgy

KW - Sinterforging

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85079419760&origin=inward

U2 - 10.37904/metal.2019.758

DO - 10.37904/metal.2019.758

M3 - Conference contribution

AN - SCOPUS:85079419760

SP - 1369

EP - 1374

BT - METAL 2019

T2 - 28th International Conference on Metallurgy and Materials, METAL 2019

Y2 - 22 May 2019 through 24 May 2019

ER -