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一、前言机器制造中,凡是受力較大的渗碳齿輪在选用材料时大多喜用12X2H4A或12XH2A等低碳鎳鉻鋼,因为这些鋼的强度、塑性、韌性及表面对缺陷敏感性方面都是最好的一种渗碳用钢,在热处理工艺中也容易掌握,但它的缺点是:需用大量鎳銘合金。因此有必要在不影响产品質量的前提下寻找适当的代用鋼材。我厂去年會試用18XFM代替12X2H4A來制造汽輪机中的齿輪,但因其渗碳工艺与鎳鉻渗碳略有不同,开始时,未能很好掌握,因而在使用过程中發現齿輪表面含碳量过高,造
First, the foreword In the machine building, all the carburized gears with larger forces are mostly interested in low-carbon nickel-chrome steel, such as 12X2H4A or 12XH2A, because of the strength, ductility, toughness and surface-to-defect sensitivity of these steels The best of a carburizing steel, heat treatment process is also easy to grasp, but its disadvantage is: the need to use a large number of nickel Ming alloy. Therefore, it is necessary to find suitable substitute steel without affecting the product quality. I plant last year will try 18XFM instead of 12X2H4A to make the turbine in the gear, but because of its carburizing process and nickel-chromium carburizing slightly different, at the beginning, not a good grasp, and thus found in the use of gear surface carbon Too high, made