奥氏体等温淬火灰口铸铁

Austempered Gray Cast Iron

选用三种牌号灰铸铁 （ Ｈ Ｔ１５０ 、 Ｈ Ｔ２００ 、 Ｈ Ｔ２５０） ， 采用不同热处理 （９００ ℃奥氏体化后， 在２８０ ℃、３２０ ℃、３７０ ℃下进行等温淬火） 后， 分析了热处理后的力学性能等与等温温度的关系； 通过对亚共晶、过共晶灰铸铁等淬后性能的对比， 发现过共晶灰铸铁热处理后性能提高幅度虽不如亚共晶灰铁， 但仍有一定改善； 应用表明， 奥氏体等温淬火工艺应用于灰铸铁件， 获得的奥贝灰铁件兼具较好的抗拉强度和耐磨性。

The relationships between the heat treatment conditions and mechanical properties of three gray cast iron,HT150,HT200 and HT250,austempered at 280℃,320℃ and 370℃ after austenitizing at 900℃ are studied and the mechanical properties are compared with those of austempered hyper and hypo eutectic gray cast iron.It is found that the mechanical properties of hyper eutectic gray cast iron after austempered can be increased,but it is inferior to the hypo eutectic gray cast iron.The results of production application showed that the heat treatment of austempering is used in the gray cast iron which should have a high tensile strength and abrasion resistance.