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Enhanced Densification of PM Steels by Liquid Phase Sintering with Boron-Containing Master Alloy

Maheswaran Vattur Sundaram (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Kumar Babu Surreddi ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Angela Veiga ; Sigurd Berg ; Fransisco Castro ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Metallurgical and Materials Transactions. A (1073-5623). (2017)
[Artikel, refereegranskad vetenskaplig]

Reaching high density in PM steels is important for high-performance applications. In this study, liquid phase sintering of PM steels by adding gas-atomized Ni-Mn-B master alloy was investigated for enhancing the density levels of Fe- and Mo- prealloyed steel powder compacts. The results indicated that liquid formation occurs in two stages, beginning with the master alloy melting (LP-1) below and eutectic phase formation (LP-2) above 1373 K (1100 °C). Mo and C addition revealed a significant influence on the LP-2 temperatures and hence on the final densification behavior and mechanical properties. Microstructural embrittlement occurs with the formation of continuous boride networks along the grain boundaries, and its severity increases with carbon addition, especially for 2.5 wt pct of master alloy content. Sintering behavior, along with liquid generation, microstructural characteristics, and mechanical testing revealed that the reduced master alloy content from 2.5 to 1.5 wt pct (reaching overall boron content from 0.2 to 0.12 wt pct) was necessary for obtaining good ductility with better mechanical properties. Sintering with Ni-Mn-B master alloy enables the sintering activation by liquid phase formation in two stages to attain high density in PM steels suitable for high-performance applications.

Nyckelord: Liquid phase sintering, master alloy, boron, PM steels, densification



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Denna post skapades 2017-10-26. Senast ändrad 2017-10-26.
CPL Pubid: 252780

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)

Ämnesområden

Materialvetenskap
Produktion
Hållbar utveckling
Mekanisk tillverkningsteknik
Metallurgisk process- och produktionsteknik
Metallurgisk processteknik

Chalmers infrastruktur