| Abstract: | The sintering behaviour of molybdenum pre‐alloyed sintered steels was investigated. A scanning electron microscope with a hot stage attachment was used, enabling quasi‐in‐situ observations of the sintering process. The material MSP 1.5Mo (Fe‐1.5% Mo) sinters in the austenitic phase, while MSP 3.5Mo (Fe‐3.5% Mo) sinters completely in the ferritic phase, due to the increased molybdenum mass content. The significantly higher self‐diffusion coefficient of iron in the ferritic phase leads to the accelerated sintering of MSP 3.5Mo, compared to MSP 1.5Mo. The effect on the sintering behaviour by adding the alloying elements chromium and phosphorus was also studied. While phosphorus accelerates sintering processes, chromium decreases the sintering rate. A pronounced shrinkage during non‐isothermal heating, due to cooperative particle movement, was detected for both sintered steels. |
