【摘要】 <正> 马氏体作为重要的合金相,一直是人们感兴趣的研究课题,利用激光对金属表面进行相变硬化,可以得到特殊的淬火组织。文献[2—4]对铸铁的熔凝区进行了详细的研究。我们在对灰铸更多还原

【Abstract】 Laser quenched microstructure of HT 21-40 grey cast iron Was studied by transmission electron microscopy. Results indicated that the structure is consisted of fine acicular martensite and ultrafine grained austenite. The carbon content of austenite is about 1.8%, that can also be transformed into fine acicular martensite when cooled in liquid nitrogen.更多还原