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(一)目前高碳鋼的热处理是采用分級淬火的方法,先用水淬后用油淬,因为鋼在水中的冷却速度要比在油中大的多(如在200℃-300℃的溫度区域內約大10倍左右),因此采用这种方法能使淬火过程的前阶段快冷,以保証实現馬氏体轉变,后阶段慢冷,防止鋼件因体积的迅速膨脹而出現裂紋。但这种处理过程給生产帶来了很大的不便,因为:(1)鋼件的大小形狀不一致,要求在水中停留的时間也不一样,因此需要用人工將鋼件一件件进行处理,无法实現生产过程中的自动化。(2)馬氏体轉变異常迅速,要
(A) At present, the heat treatment of high-carbon steel is the use of classification quenching method, the first water quenching oil quenching, because steel in water cooling rate is much larger than in the oil (such as in the temperature range of 200 ℃ -300 ℃ About 10 times larger), so the use of this method can quench the first stage of the rapid cooling to ensure the realization of martensitic transformation, slow cooling after the stage to prevent the rapid expansion of steel due to the volume of cracks. However, this process has brought great inconvenience to the production because: (1) the size of the steel is inconsistent in shape and shape, requiring time to stay in the water is not the same, so the need to manually pieces of steel to be processed , Can not realize the automation in the production process. (2) martensite transformation is extremely rapid, to be