25Cr5MoA/Q235钢复合板的结合性能

Bonding behavior of 25Cr5MoA/Q235 hot rolled clad plates

将25Cr5MoA/Q235钢板复合板坯加热到800～1100℃,经保温后轧制1道次,压下量为50%～70%,制成25Cr5MoA/Q235钢热轧复合板试样.用材料力学性能试验机测试复合板试样复合界面的剪切强度,用光学显微镜和扫描电镜观察界面的组织.结果表明:当轧制温度在900～1000℃时,有利于25Cr5MoA/Q235钢的复合;道次压下量对25Cr5MoA/Q235钢复合板界面结合强度影响非常大,道次压下量大,有利于形成更多洁净、活化的新生表面,并且可以细化晶粒,提高复合板的结合强度;金属组织中晶粒的梯度变化,有利于提高双金属复合材料的结合强度.

25Cr5MoA/Q235 steel clad plates were prepared with the composite slabs heated to the temperature between 800℃ and 1 100℃, held at each temperature for 30 min, rolled one pass and reduced from 50 % to 70%. Their bonding shear strengths were tested by the electron universal testing machine CMT4105 and the metallographic microstructures of their interfaces were observed by optical microscope and SEM. The results show that the rolling temperature between 900 ℃ and 1000 ℃ is favorable to the bonding of the steels and pass reduction is crucial to the bonding strength. When the pass reduction becomes large, cleaner and more activated new interfaces will be obtained and the grains will The gradient metallographic changes of grains can be refined, as a result the bonding strength can be enhanced. also raise the bonding strength of the clad plates.