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.

• 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；