硅在贝氏体／马氏体复相球铁中的作用

Behavious of Silicon in Balnite/Martensite Spheroidal Graphite Cast Ifon

研究了硅在新型贝氏体／马氏体复相球铁中的作用。结果在明：硅提高新型贝氏体／马氏体复相球铁的马氏休相变开始温度（Ｍｓ），在实验热处理工艺条件下，硅减少残余奥氏体（γ残）数量。但硅促进贝氏体转变，因而减少了复相中的马氏体数量。在２．５％～３．７ｗｔ％范围内，哇含量提高，新型贝氏体／马氏体复相球铁的冲击韧性提高。

Behavious of Si in bainite /martensite spheroidal graphite( B/M SG)cast iron have beeninvestigated.The resuts show :Si increases martensite transformation starting temperature(Ms)of the B/M SG castiron. Under the experimental heat treatment conditions.Si decreases the amount of retained austenite. but promoteshinitic transformation. As a result. Si decreases the amount of martensite. The impact energy of the B/MSG castiron increases with the increase of Si content in the range from 2.5 to 3.7 wt%。