10Ni5CrMoV钢低温冲击断裂行为研究

采用示波冲击试验方法，研究了１０Ｎｉ５ＣｒＭｏＶ钢在冲击断裂过程中各部分能量与温度的关系。在２０℃～－１００℃温度范围内，裂纹形成功（Ｅｉ）基本不变，裂纹扩展功（Ｅｐ）显示与总冲击功相一致的转变特征。在上平台，１０Ｎｉ５ＣｒＭｏＶ钢具有高的裂纹扩展功，Ｅｐ＞１００Ｊ；在转折区，钢的韧脆转变平缓。试验结果表明，Ｅｐ＝Ｅｉ对应的温度可作为韧脆转折温度。本试验钢的韧脆转折温度低达－８５℃，具有优良的低温韧性。

Low Temperature Impact Fracture Behavior of 10Ni5CrMoV Steel

For 10Ni5CrMoV steel, by an instrumented Charpy impact test, the relationship of energies at various stages during impact fracture vs temperatures was studied. In the temperatuer range from 20℃ to -100℃ ,the crack initiation energy E i is almost unchanged, but its crack propagation energy E p has a transition characteristics very similar to that of the total impact energy. At the upper plateau, the steel has high E p (100J); in the transition zone, the ductile brittle transition occurs in a wider temperature range. The results show that the temperature at E p= E i can be defined as ductile brittle transition temperature , which of the steel is as low as -80℃, and that 10Ni5CrMoV steel has an excellent low temperature toughness.