稀土Ce对DH36船板钢力学性能的影响

Effect of Rare Earth Ce on Mechanical Properties of DH36 Ship Plate Steel

采用ZG-01型真空感应炉冶炼了不同Ce含量的DH36船板钢,对该试验钢显微组织和力学性能进行了分析。结果表明,当Ce含量为0.0092%时,试验钢具有良好的力学性能。与未添加Ce的试验钢相比,Ce含量为0.0092%的试验钢的抗拉强度、屈服强度、断后伸长率、冲击功、硬度均增大。稀土Ce加入后,珠光体和铁素体的晶粒尺寸减小,珠光体变得更加弥散;试验钢中的MnS、Al_(2)O_(3)、MnS+Al_(2)O_(3)复合夹杂被改性为Ce-Al-O-Mn系复合夹杂、CeAlO_(3)+MnS系复合夹杂、CeO_(2)夹杂,钢中Al_(2)O_(3)等夹杂物尺寸明显降低。

DH36 ship plate steel with different Ce contents was smelted using ZG-01 vacuum induction furnace,and the microstructure and mechanical properties of the test steels were analyzed.The results show that when the Ce content is 0.0092%,the test steel has good mechanical properties.Compared with those of the test steel without Ce,the tensile strength,yield strength,elongation,impact energy and hardness ofthe test steel with 0.0092%Ce all increase.With the addition ofrare earth Ce,the grain size of pearlite and ferrite decreases,and the pearlite becomes more dispersive.The MnS,Al_(2)O_(3)and MnS+Al_(2)O_(3) composite inclusions in the test steel are modified to Ce-Al-O-Mn system composite inclusions,Ce-Al-O-Mn-S system composite inclusions and CeO_(2),inclusions.The size of Al_(2)O_(3) and other related inclusions in the steel is significantly reduced.