低碳超高强度Q&P钢板的热处理工艺和组织性能

Heat Treatment Process and Structure of a Low Carbon Super-high Strength Quenching and Partitioning Steel Plate

试验的Q&P(淬火和配分)钢(%:0.17C、1.40Si、1.48Mn、0.25Al)由7.5 kg真空感应炉冶炼,轧成1.0～1.5 mm钢板,采用井式盐浴炉模拟了试验Q&P钢的热处理工艺,经910℃奥氏体化,淬至200～245℃,20 s,升温至配分温度300～450℃,60～600 s,快冷。结果表明,采用淬火245℃20 s,配分300～350℃≥300 s可保证碳原子由马氏体向残留奥氏体富集,试验钢具有高的强塑积(25 000～30000 MPa%)。

Test Q＆P （quenching and partitioning） steel （% ： 0. 17C, 1.40Si, 1.48Mn, 0. 25Al） was mehed by a 7.5 kg vacuum induction furnace then rolled to 1.0 2. 1.5 mm plate. The heat treatment process of the test Q＆P steel plate was simulated by a shaft salt bath furnace with austenizing at 910 ℃, quenching to 200 -245 ℃ for 20 s, heating to partitioning temperature 300 -450 ℃ for 60 - 600s, then quick cooling. Results show that with quenching to 245 ℃ for 20 s, partitioning at 300 -350 ℃ for ≥300 s, it is available to assure the Carbon atom accumulating to residual austenite from martensite and get high product of strength-elongation （25 000 - 30 000 MPa% ）.