Authors:
Takuya Takashita (JFE steel corporation, Japan),
Shigeru Unami (JFE steel corporation, Japan)
Abstract:
Both compressibility and hardenability are required for the alloyed steel powder for the as-sintered process. In this research, the Cu pre-alloying for the Fe-Mo alloyed steel powder, which has good compressibility, is investigated for improving hardenability. As a result, the unique phenomena was found that both compressibility and hardenability of the Fe-Mo alloyed steel powder was improved by Cu pre-alloying. And the mechanism of the phenomena was investigated by the TEM observation. The size of Cu precipitates in Fe-Mo alloyed steel powder increased with an increase in Cu pre-alloying, and it improved the compressibility. In addition, Cu precipitates were solute into the matrix of the sintered microstructure during sintering, and solute Cu improved the hardenability. As a result, the as-sintered material with bainite and martensite microstructure was obtained. Because of these improvements of the compressibility and the hardenability, higher strength as-sintered material was obtained compared with conventional as-sintered material.
DOI:
https://doi.org/10.59499/WP225372029