the main reasons bring hardness remarkable improvement are disperse reinforcement of un melt SiC and propitiation FeSiC, and solution reinforcement of decompounded Si, C.

• 造成熔覆层硬度显著提高的原因是未熔 Si C；析出相 Fe Si C的弥散强化和熔入的 Si；C元素引起的固溶强化作用 .