通过显微硬度、拉伸、冷弯等力学性能的测试以及金相组织的观察，研究了相同轧制工艺条件下钼、钛对700MPa级耐候钢的组织类型和力学性能的影响规律。结果表明，钼促进M／A岛的生成，钛抑制M／A岛的生成；M／A岛作为一种硬相组织，对材料的韧性和塑性有不利影响，M／A岛含量过高，冷弯过程中出现明显裂纹；微合金元素钼和钛对材料强度的提高有促进作用，在钼、钛合理配比情况下，试验钢的力学性能达到最佳效果。
By metallurgical structure observation and measurement of mechanical properties such as micro-hardness, tensile test, cold-bend, the effect of Mo and Ti on the microstructure and mechanical properties of 700 MPa weathering steel were studied under the same rolling conditions. The results show the formation of M/A is promoted by Mo, while inhibited by Ti. Furthermore, M/A island, as a hard phase, is harm to the material toughness and plasticity, high M/A island content will result in obvious crack during cold bending. However, the strength can be enhanced by micro-alloy element Mo and Ti. The optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Mo and Ti.
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