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为了缩短贝氏体转变时间并减少生产成本,设计并冶炼了一种新的贝氏体钢种,在Gleebe-1500热模拟实验机上测定其热膨胀曲线,结合显微组织图绘制了实验钢的CCT曲线。根据CCT曲线进行低温等温转变实验,对热处理试样进行拉伸试验,获得了实验钢低温转变后的力学性能。通过TEM观察发现低温转变的实验钢是由亚纳米级的超细贝氏体、马氏体等组成的一种超细贝氏体钢。340℃×2 h的低温等温转变,实验钢的抗拉强度达到1470 MPa,伸长率为15%。
In order to shorten the bainite transformation time and reduce the production cost, a new kind of bainitic steel was designed and smelted. The thermal expansion curve was measured on a Gleebe-1500 thermal simulation machine, and the experimental steel CCT curve. According to the CCT curve, the low temperature isothermal transformation experiment was carried out, and the tensile test was carried out on the heat treated sample to obtain the mechanical properties after the low temperature transformation of the experimental steel. TEM observation found that low temperature transformation of the experimental steel is sub-nanoscale superfine bainite, martensite and other components composed of a superfine bainitic steel. 340 ℃ × 2h low temperature isothermal transformation, the experimental steel tensile strength reached 1470 MPa, elongation of 15%.