热处理工艺对钢板组织性能的影响研究
Research of Effect of Heat Treatment on Microstructure and Property of Steel Plate

以海洋平台用Q690高强钢的热处理工艺开发为背景，在不改变材料成分的前提下，根据Q-P-T热处理新工艺，将普通高强钢的屈服强度和抗拉强度进行有效提升。利用软件对钢板的油淬和Q-P-T热处理工艺的温度场进行模拟，得到不同热处理工艺下温度随时间的变化规律，并通过模拟并比较不同热处理工艺下材料的组织成分和含量，确定最佳的热处理工艺。在热处理实验中用不同的热处理工艺处理原始材料，对比不同热处理工艺下材料的力学性能。实验验证得出，经Q-P-T工艺处理后的钢板的强塑积相对于其他工艺有较大的提升。研究结果表明Q-P-T钢组织由马氏体、残余奥氏体和弥散析出的碳化物组成，这些组织对提高钢的强塑积具有重要的意义。
The offshore platform with the development of heat treatment process of Q690 high strength steel as the background, without change in the composition of the materials, according to the new Q-P-T heat treatment process, the high yield strength and tensile strength of steel are effectively improved. The temperature field of oil quenching and Q-P-T heat treatment process of steel plate is simulated via numerical simulation, and the variation of temperature with the time is obtained under different heat treatment conditions. Besides, the optimum heat treatment process was determined by simulating and comparing the tissue composition and content of the materials under different heat treatment processes. In heat treatment experiments, different heat treatment processes were used to treat the original material to compare the mechanical properties of the materials under different heat treatment processes. The experimental data show that the strength and ductility of the steel plate treated with Q-P-T process are greatly improved comparing with the other processes. The results show that the microstructure of Q-P-T steel is composed of martensite, retained austenite and dispersed carbide. These microstructures are of the great importance to improve the strength and ductility of steel