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利用高功率CW CO_2激光束在细片状石墨加珠光体的灰铸铁表面上进行激光Si合金化的基础研究。基材成分(wt%)为C3.0、Si2.2、Mn1.0、Cr 0.40,其碳当量为3.68。合金粉末为Si75+Fe25(wt%)。研究结果表明即使在合金熔体的冷却速度达到10~3K/s 的数量级,Si的平均含量为5.37%的条件下,仍然未能抑制在表面 Si 合金化层中出现石墨化倾向。新的表面合金中不存在r-Fe 和 Fe_3C。利用共晶度对 Si 含量的敏感性,直观地证实了在合金熔池的固—液界面附近确实存在传质现象。
The fundamental research of laser Si alloying on the surface of flake graphite plus pearlite gray cast iron with high power CW CO_2 laser beam was carried out. The composition (wt%) of the base material is C3.0, Si2.2, Mn1.0, and Cr0.44, and the carbon equivalent thereof is 3.68. The alloy powder is Si75 + Fe25 (wt%). The results show that the tendency of graphitization in the surface Si-alloying layer can not be suppressed even when the cooling rate of the alloy melt reaches the order of 10 to 3 K / s and the average content of Si is 5.37%. The new surface alloy does not exist r-Fe and Fe_3C. The use of eutectic degree of Si content of the sensitivity, intuitively confirmed in the alloy melt pool near the solid-liquid interface does exist mass transfer phenomena.