非合金化管坯冲孔模使用寿命的研究

Research on Life Span of Non-alloyed Piercing Diefor Shell

研究用非合金化奥氏体-贝氏体球铁取代铁素体-珠光体稀土镁钼球铁,提高管坯冲孔模使用寿命的可行性。研究结果表明:球化处理+二次孕育处理的冶炼工艺提高了管坯冲孔模的铸态性能;900℃奥氏体化3h、400℃等温处理3h及水+油的双液快冷的热处理工艺,在管坯冲孔模的工作层中得到了奥氏体-贝氏体组织。经冶炼、热处理后的奥氏体-贝氏体球铁冲孔模的力学性能得到提高,使用寿命延长。

The research involves the feasibility of enhancing the life span of the piercing die for shell by replacing the die material of the ferrite-pearlite rare earth Mg-Mo nodular iron with the non-alloyed austenite-bainite nodular iron.The result shows that the smelting process of nodulizing plus secondary inoculation has improved the as-cast properties of the piercing die,and that the austenite-bainite structure is formed in the working layer of the die owing to the heat treatment processes,including3-hour long austenization at900℃,3-hour long isothermal treatment at400℃and two-liquid quick-cooling with water and oil.Thanks to the said smelting and heat treatment processes,the mechanical properties of the austenite-bainite nodular iron-made piercing die have been improved,and its service life prolonged.