论文部分内容阅读
目前机械厂广泛应用的大規格高速鋼,一般都由于碳化物不均匀性級别較高,从而恶化了高速鋼的一系列性能,特别是切削性能。为了降低大規格高速鋼的碳化物不均匀性級别,冶金厂多采用大鋼錠澆注,从而增加鍛压比。但是大鋼錠在鋼液凝結过程中促使碳化物集聚,形成碳化物剝落,在鋼錠上部尤其显著,这样滿足不了“57工特”技术条件的要求。同时高速鋼是一种高合金鋼,其热加工性能很差,在鍛造过程中极易产生裂紋。基于上述存在問題并遵照国家科委与冶金部的指示,我們在W18Cr4V鋼中进行了加稀土試驗,探討稀土改善碳化物的分布、提高加工性能和切削性能的可能性。根据有关資料,稀土可改善高速鋼的鑄态組織、碳化物
Currently widely used machinery plant large-size high-speed steel, usually due to high levels of carbide heterogeneity, thereby deteriorating a series of high-speed steel performance, especially cutting performance. In order to reduce the level of large-size high-speed steel carbide unevenness, metallurgical plants use more steel ingot pouring, thereby increasing the forging ratio. However, the large ingot in the liquid steel to promote the process of carbide agglomeration, the formation of carbide spalling, especially in the upper part of the ingot, so that can not meet the “57 special” technical requirements. At the same time, high-speed steel is a kind of high-alloy steel, its thermal processing performance is very poor, prone to cracks in the forging process. Based on the above problems and in accordance with the instructions of the State Science and Technology Commission and the Ministry of Metallurgy, we conducted a rare earth test in W18Cr4V steel to investigate the possibility of improving the distribution of carbides and improving the processing and cutting performance of rare earths. According to the relevant information, rare earth can improve the high-speed steel castings, carbides