利用Gleeble-1500热/力模拟试验机,研究了单向拉、压应力作用下HQ785钢连续冷却转变的CCT曲线及相变动力学曲线。结果表明,连续冷却转变时,外加应力使试验钢贝氏体相变开始温度明显提高;相同冷速下,拉应力比压应力对Bs的提高更为显著;拉、压应力都使试验钢的贝氏体转变区域变宽;拉应力对整个贝氏体相变都有显著的促进作用,而在压应力下,相变初始阶段受到抑制,应力越大抑制越明显。 The Gleeble-1500 heat / force simulator was used to study the CCT curve and the phase transition kinetic curve of HQ785 steel subjected to continuous cooling under uniaxial tension and compressive stress. The results show that when the continuous cooling transformation is applied, the initial temperature of the bainite transformation of the test steel increases obviously due to the applied stress. Under the same cooling rate, the tensile stress is more significant than the increase of the Bs stress. Bainite transformation area broadened; tensile stress on the whole bainite phase transformation has a significant role in promoting, and in the compressive stress, the initial phase of phase change is inhibited, the greater the inhibition of the more obvious stress.