抄録
The present writers made specimens by chill casting added Si, Mn and Cr as 3rd elements to Fe-C alloys, and tempered them at 900°C, 1000°C and 1100°C respectively and examined the growing process of graphite by the microscope. According to these experiments occurrences of all graphite particles were at the boundary austenite and peaky cementite, and then they grew both in austenite and cementite regions as Si was added, but the growth was only toward austenite region as Mn or Cr was added. Much tempering time was required before graphite occurs, but when graphite particles was produced, graphitization will swiftly advance.
