Phase and structure changes during the sintering of compacts of high-speed steels obtained from powders with various rates of solidification

Consolidation of Nanostructured β‐SiC by Spark Plasma Sintering

“…Stacking faults in SiC, however, have been reported to play a major role in electric transport phenomena. 31 The effect of structural defects on the sintering has been observed by Ulshin et al 32 They reported a higher rate of shrinkage in steel powders with a cellular structure, and the disappearance of these defects during sintering.…”

Structure formation during activated sintering of high-speed steel

“…In solid-phase sintering of high-speed steel powders material density does not increase markedly [1][2][3]. At the same time sintering technology in the presence of a liquid phase in order to obtain an almost pore-free state requires quite stringent control of the sintering temperature close to the solidus point [4].…”

“…At the same time sintering technology in the presence of a liquid phase in order to obtain an almost pore-free state requires quite stringent control of the sintering temperature close to the solidus point [4]. However, even with observation of this requirement the structure of high-speed steel after liquid-phase sintering contains a relatively coarse eutectic carbide network that markedly reduces both the physicomechanical and operating properties of the material compared with similar steels prepared by solid-phase sintering and subsequent hot forming [3].…”

“…Drawing attention to the increased carbon content in phases it is possible to suggest that they correspond to carbides of the type M 7 (B, C) 3 . Cobalt and nickel are almost entirely absent from carbide inclusions and are uniformly distributed within the austenite component of sintered steel.…”

Manganese-like metastable phases in the Fe–Mo system: experimental study and thermodynamic modeling. I. Crystalline state of Fe–Mo melt-spinning alloys

“…In addition, complex intermediate phases with structures isomorphic to polymorphic modifications α-and β-Mn, the so called χ and π phases [4,[10][11][12], have been revealed in steels and four-component Fe-Mo(W)-Cr-C alloys (including bounding three-component alloys) in bulk samples produced by ordinary metallurgical methods, thermodynamically equilibrium alloys, and in rapidly quenched (RQ) alloys. These structures are brittle and cannot be regarded as hardening, but their participation in phase transformations when material is treated substantially modifies the structure and properties [13]. The conditions in which the χ and π phases exist, the temperature and composition ranges of existence in stable and metastable states, relative stability, and transformations in which these phases participate still have to be investigated in iron-based alloys, though these phases have long been revealed in industrial alloys.…”