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为了提高铬铸件的淬透性,必须加入一些元素(如锰),这些元素的加入可提高铁素体区和过渡区中奥氏体的稳定性,但因此会降低马氏体的相变温度和增加残余奥氏体的数量,从而降低了铬铸铁的耐磨性。为选择最佳锰含量,研究了锰对含铬12—22%、含碳3%的铸铁淬透性的影响。研究表明,薄壁铸件(3×12×12mm)的硬度不受铬量的影响而取决于锰含量。这是因为碳化物的额外溶解而提高了固溶体的合金化程度。对含12—18%铬的铸铁来说马氏体相变温度的降低程度是一样的。
In order to improve the hardenability of chromium castings, some elements (such as manganese) must be added. The addition of these elements can improve the stability of the austenite in the ferrite zone and the transition zone, but it will reduce the martensitic transformation temperature And increase the amount of retained austenite, thereby reducing the wear resistance of chromium cast iron. In order to choose the best manganese content, the effect of manganese on the hardenability of cast iron with 12-22% chromium and 3% carbon was studied. Studies have shown that the hardness of thin-walled castings (3 × 12 × 12mm) is independent of the amount of chromium and depends on the manganese content. This is because the additional dissolution of carbides increases the degree of alloying of the solid solution. The reduction in martensite transformation temperature for cast iron with 12-18% chromium is the same.