We assume that the ultrahigh hardness is mainly due to the ultrafine grains, high density dislocation and more content of carbon in martensite.
研究分析表明,晶粒细化、高的马氏体含量、马氏体高位错密度和固溶含碳量是获得超高硬度的主要原因。
2
The results show that P/M valve seats using this technology has high density and highcarbon content , and their microstructure are martensite , bainite and network carbide.
结果表明,采用该工艺可获得高密度、高碳含量、具有马氏体、贝氏体和网状碳化物组织的粉末冶金气门座。
3
Observations showed that the micro-structure of the steel after forging or high temperature rolling was composed of low-carbonmartensite, a little part of bainite and residual austenite.