PRE-ALLOYED BORON IN POWDERED METAL (P/M) STAINLESS STEELS

摘要

The demand for high-density stainless parts continues to grow as P/M continues to battle conventional stainless. The compressibility and hence the final sintered density of P/M stainless steels are limited due to their high alloy content. The addition of boron allows P/M to produce nearly full density parts that achieve mechanical properties similar to wrought materials. By adding boron to the melt prior to atomizing, the segregation of boron is minimized leading to a more uniform microstructure and properties. The present work will examine the role of pre-alloyed boron in both austenitic and ferritic stainless steels. Experimental work will involve the measurement of green and sintered properties. Using the laboratory experiments as a guide, specimens will be sintered in production furnaces to determine the performance of various grades of boron containing stainless steels. The specimens will be evaluated for density distribution, dimensional stability and mechanical properties.