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近二十多年来,气体渗碳的广泛采用使得热处理行业的面貌为之一新,并已在热处理工业中占据着重要的地位。可是它的最大缺点是处理周期较长,因而成本也较高。为此,六十年代初期,国外热处理界就注目于高温渗碳了。如所周知,提高渗碳温度可以缩短渗碳时间,但提高渗碳温度(如高于950～980℃),炉子的寿命就会大大降低,而且还可能引起钢的晶粒长大。对于后者,固然可以通过采用细晶粒钢(如添加铝及
In the recent two decades, the widespread use of carburizing gas has made the heat treatment industry one of the newest and occupies an important position in the heat treatment industry. However, its biggest drawback is the longer processing cycle, and therefore higher costs. To this end, the early sixties, foreign heat treatment sector to focus on high temperature carburizing. As we all know, to increase the carburizing temperature can shorten the carburizing time, but to raise the carburizing temperature (such as higher than 950 ~ 980 ℃), the furnace life will be greatly reduced, but also may cause steel grain growth. For the latter, of course, by using fine grain steel (such as the addition of aluminum and