二冲程（two-stroke）的两道环都是球墨铸铁材料（ductile cast iron）； 四冲程（four-stroke）的一道环为钢质 氮化亮线（nitriding steel for one ring），二道环为球墨铸铁环，镀铬油环（ductile ...
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因此，确定球墨铸铁材料对激光的吸收率十分必要。
So it is necessary to determine the laser absorptivity of ductile iron.
为激光处理球墨铸铁材料时工艺参量的选择和优化提供了一定参考。
It provides some reference for the selection and optimization of technical parameters during the laser material processing.
本研究针对常用的灰铸铁及球墨铸铁材料分别进行激光处理、感应淬火和氨化处理，然后进行耐磨性对比试验。
This paper is the research of wear resistance for the specimen of grey cast iron and nodular iron by laser treating, induction hardening and nitrocarburizing.
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