Springer-Verlag,  Gierl-Mayer, C. Log In Sign Up. Higher decarburization of material sintered in pure hydrogen is a consequence of methane formation, which is supported by alloying elements like Si, Cr and Mn . Stoichiometry showed closeness of carbonitrides to M2 CN. Semiquantitative EDX analysis of material sintered in N2-H2 atmosphere showed presence of nitrogen in precipitates, Fig. Theoretical prediction of microstructure of the material was done using Thermo- Calc and JMatPro software.
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Sintering in different atmospheres of T15 and M2 high speed steels produced by a modified metal injection moulding process. Metallographic observations of the microstructure confirmed theoretical predictions.
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Computational thermodynamics is a powerful tool for calculating equilibria and predicting microstructure and properties of materials. Skip to main content. Thermo-Calc calculation gives information about equilibrium state, but for PM materials, reaching the equilibrium is quite problematic even at sintering temperature.
Cold compaction at pressure of MPa was applied for all samples. Stoichiometry showed closeness of carbides to M7C3. Microstructure and EDX analysis of precipitates, material sintered in argon atmosphere. The microstructure of material sintered in N2-H2 atmosphere, Figs. Prediction, formation and analysis of the microstructure of high Cr-alloyed PM steel and the influence of sintering atmosphere on the microstructure and mechanical properties were investigated in the present contribution.
Christian Gierl-Mayer for sintering experiments in the argon atmosphere.
Metallurgical Transactions A, vol. The absence of carbon in atmospheres of argon and hydrogen led to strong decarburization and grain growth. Removal of carbon occurs preferably along austenite grain boundaries.
N2-H2 atmosphere is better than argon and pure hydrogen for sintering of the investigated powder. The sintering atmosphere also affects the mechanical properties of the sintered materials. These elements have very high affinity to oxygen and create stable oxides on the surface of powder particles .
Enter the email address you signed up with and .62.1 email you a reset link. The austenite grain boundaries without carbides can move, which leads to grains growth.
Help Center Find new research papers in: Powder Metallurgy of Iron and Steel. Stoichiometry showed closeness of carbonitrides to M2 CN. Figures 4 a, b present an example of microstructure of the investigated material sintered in the argon atmosphere.
Hardness of investigated materials. Higher decarburization of material sintered in pure hydrogen is a consequence of methane formation, which is supported by alloying elements like Si, Cr and Mn . Applied Surface Science, vol. One more important aspect should be taken to account during sintering is the atmosphere.
Sintering in N2-H2 atmosphere results in intense nitrogen pick-up due to high chromium content, increasing nitrogen content by up to 0. ASM International, www. International atlas of powder metallurgical structures. At the sintering temperature, carbides dissolve and carbon is removed from the sample, because atmosphere does not contain any carbon.
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All calculations were done jmaypro two nitrogen content levels, which correspond to compositions of material sintered in N2-H2 and atmosphere without nitrogen pure H2 and argonrespectively. A study of chromium carbide precipitation at interphase boundaries in stainless steel welds. Using such alloying elements as manganese, silicon and chromium leads to more demanding sintering conditions.
Powder Metallurgy Progress, Vol.