摘要
采用热膨胀法和金相法,通过Gleeble-1500热模拟试验机测定C-Mn-Si系低碳(/%:0.11C、1.15Si、1.85Mn、0.032Al、0.003 Ti、0.002 4N)和中碳(/%:0.35C、1.11Si、1.82Mn、0.041Al、0.002 Ti、0.004 2N)贝氏体钢在0.5～30℃/s的冷却速度下连续冷却时的膨胀曲线,确定相变点,并结合显微组织,借助Origin软件分别绘制出两种钢的连续冷却转变(CCT)曲线。结果表明,0.11%C钢当冷却速度≤1℃/s时获得铁素体+贝氏体+马氏体组织,冷却速度≥2℃/s时为贝氏体+马氏体组织,0.35%C钢冷却速度≥0.5℃/s即可获得贝氏体+马氏体组织;随碳含量增加,贝氏体和马氏体转变温度均降低。
Dilatation curves of C-Mn-Si series low carbon （/% ： 0. 11C, 1.15Si, 1.85Mn, 0. 032A1, 0. 003Ti, 0. 002 4N） and medium carbon （/% ： 0. 35C, 1.11Si, 1.82Mn, 0. 041A1, 0. 002Ti, 0.004 2N） bainite steel continuous cooling with cooling rate 0. 5 - 30 ℃/s have been measured by using thermal dilation method and metallographic examina- tion with the Gleeble-1500 hot simulation machine to define the phase transformation points, and combined with microstruc- ture observation, the continuous cooling transformation （CCT） curves of two steels are respectively plotted by Origin soft- ware. Results show that with cooling rate ≤ 1 ℃/s, the structure of 0. 11% C steel is ferrite ＋ bainite ＋ martensite, as cool- ing rate 32 ~C, its structure is bainite ＋ martensite, and with cooling rate ≥0. 5 ℃/s the 0. 35% C steel has bainite ＋ martensite structure ; with increasing carbon content, the transformation temperature of bainite and martensite all decreases.
出处
《特殊钢》
北大核心
2012年第2期68-70,共3页
Special Steel
