摘要
试验42CrMoTiB钢和稀土微合金化42CrMoTiBRE钢(/%:0.41～0.43C、0.36～0.38Si、0.59～0.72Mn、0.018～0.020P、0.005～0.010S、1.08～1.13Cr、0.16～0.19Mo、0.06～0.08Ti、0.003～0.004B、0～0.020Ce或Sm,0.001 3～0.001 5T[O])由150 kg真空感应炉冶炼,浇铸成平均断面尺寸165 mm×165 mm的钢锭,锻成120mm×120 mm钢坯。研究了Ce或sm对42CrMoTiB钢锻坯夹杂物和力学性能的影响。结果表明,与未加稀土42CrMoTiB钢相比,加入0.18RE后(钢中RE含量0.019%～0.020%)42CrMoTiBRE钢中的夹杂物含量大幅降低,A类、B类和D类粗系夹杂级别分别由0.5、2.0和0.5降低至0、0～0.5和0,细系夹杂分别由0.5、1.5和2.0降低至0、1.0和1.0。加入RE改变了钢中夹杂物形貌,形成球形稀土硫氧化物;加稀土明显提高钢的塑性和韧性,与42CrMoTiB钢相比42CrMoTiBCe钢横向断面收缩率(Z)和夏比冲击功(A_(KV))分别由22%和17 J/cm^2提高至30%和28 J/cm^2。
The test steel 42CrMoTiB and RE microalloying steels 42CrMoTiBRE （/% ： 0.41 - 0. 43C, 0. 36 -0. 38Si, 0. 59 -0. 72Mn, 0. 018 -0. 020P, 0. 005 -0. 010S, 1.08 - 1.13Cr, 0. 16 -0. 19Mo, 0. 06 -0. 08Ti, 0. 003 -0. 004B, 0 0. 020Ce or Sm, 0. 001 3 -0.001 5 T [ O] ） are melted by an 150 kg vacuum induction furnace, casting average cross section 165 mm ×165 mm ingot then forged to 120 mm x 120 mm billet. The effect of Ce or Sm on inclusions and mechanical properties of steel 42CrMoTiB forged billet is studied. Results show that as compared with non-adding RE steel 42CrMoTiB, the inclusion amount in steel 42CrMoTiBRE with adding 0. 18RE （ RE content in steel- 0. 019% - 0. 020% ） decreases obviously, the inclusion rating units of heavy series A, B and D respectively decrease from 0. 5, 2. 0 and 0. 5 to 0, 0 - 0. 5 and 0, and that of thin series respectively decrease from 0. 5, 1.5 and 2.0 to 0, 1.0 and 1.0 ; The morphology of inclusions in steel is modified by adding RE to form spherical RE oxysulfide ; and the plasticity and toughness of steel markedly increase by adding RE, as compared with non-adding RE steel 42CrMoTiB the transverse reduction of area （Z） and Charpy V-notch impact energy of steel 42CrMoTiBCe increase respectively from 22% and 17 J/cm^2 to 30% and 28 J/cm^2.
出处
《特殊钢》
北大核心
2013年第3期56-59,共4页
Special Steel
基金
安徽省马鞍山市2011年度市战略性新兴产业科技计划(2011-Z-09)
