非合金化管坯沖孔模使用壽命的研究

Research on Life Span of Non-alloyed Piercing Diefor Shell

摘要: 研究用非合金化奧氏體-貝氏體球鐵取代鐵素體-珠光體稀土鎂鉬球鐵,提高管坯沖孔模使用壽命的可行性。研究結(jié)果表明:球化處理+二次孕育處理的冶煉工藝提高了管坯沖孔模的鑄態(tài)性能;900℃奧氏體化3h、400℃等溫處理3h及水+油的雙液快冷的熱處理工藝,在管坯沖孔模的工作層中得到了奧氏體-貝氏體組織。經(jīng)冶煉、熱處理后的奧氏體-貝氏體球鐵沖孔模的力學(xué)性能得到提高,使用壽命延長。

Abstract: 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,including 3-hour long austenization at 900℃,3-hour long isothermal treatment at 400℃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.