Manganese In Powder Metallurgy Steels
- ID: 2317161
- July 2012
- 380 Pages
- CISP - Cambridge International Science Publishing
The monograph introduces the data about the mechanical properties of sintered manganese steels published since 1948 up to the present time. The effect of all possible material, alloying and sintering factors on the properties of manganese steels which are in most cases on the level of those alloyed with nickel is discussed. The sintering of the steels was successfully carried out under laboratory and industrial conditions not fulfilling the thermodynamic requirements for the Mn-O system.
The reduction - (self cleaning) effect of manganese vapour for the sintering atmosphere formed by sublimation due to manganese high vapour pressure is presented as the only possible mechanisms under which the sintering of manganese-containing steels takes place. It is stated conclusively that sintering under this mechanisms occurs without demanganisation and decarburization of the compacts in the atmosphere with the low dew point contrary to that with a high dew point adversely affecting the sintering and alloying process.
The book presents a complex historical, technical and scientifical state of the art about the preparation and properties of the sintered manganese steels. Sintering is explained in detail by the original knowledge about the effect of gaseous manganese on the process as the only possible effect. The monograph is based on a large number of references and is completed by a list of other publications dealing with sintered manganese steels.. The book is highly suitable for researchers and for PM parts and powder producers. It contains a very large number of graphs, micrographs and tables.
Thermodynamics of Mn-O system
Manganese high vapour pressure - effect of gaseous manganese on sintering and alloying (basic data, physical effects, reaction Mn(g) - O, condensation, alloying)
Manganese carrier (electrolytic manganese, ferromanganese, master alloys, carbides, Mn prealloyed powders)
Properties of Fe-Mn-(C), Fe-Mn-(xMn)- (C) steels (Mn and C content, compaction pressure, additional elements, sintering conditions)
Sintering conditions (common, short time, induction, in phase)
Properties of hybrid Cr, Mo-Mn steels (Mn and C content, sintering conditions)
Dilatometer tests of the sintering process (Mn an C content, iron powder grade, prealloyed powders, processing conditions)
Heat treatment (transformation of manganese austenite, cooling rate, effect of Mn and C content, sinter hardening)
Effect of the atmosphere purity (dew point -30 C, -70 C)