Wang Chunyang, Liu Xinhua, Jiang Yanbin, Xie Jianxin, Zhang Xiaojun, Zhou Dejing
Key Laboratory for Advanced Materials Processing of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China; AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China.
Key Laboratory for Advanced Materials Processing of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China; Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China.
Sci Bull (Beijing). 2018 Nov 15;63(21):1448-1456. doi: 10.1016/j.scib.2018.09.023. Epub 2018 Sep 29.
Embedded aluminum-steel composite sheets used in heat exchanger were produced by cold roll bonding (CRB). The influences of annealing temperature and annealing time on the microstructure and the bonding strength of the composite sheet were investigated. The recrystallization of the steel layer began at 525 °C and finished at 600 °C. With the increase of the annealing temperature, the peel strength of the composite sheet whose original steel sheet surface was treated by scratch brush initially increased and then decreased, which was resulted from the competition of the mechanical locking and metallurgical bonding. After annealing, the cracks which formed between the broken work-hardened steel surface layer and its matrix during cold roll bonding remained. The composite sheet produced by CRB with the steel surface treatment of flap disc had less interfacial defects, higher bonding quality, higher diffusion rate of Al and Fe atoms at the interface and larger metallurgical bonding extent than the composite sheet produced by CRB with the steel surface treatment of scratch brush under the same conditions of annealing, which was helpful to shorten annealing time, reduce energy consumption and improve production efficiency.
用于热交换器的嵌入式铝钢复合板是通过冷轧复合（CRB）工艺生产的。研究了退火温度和退火时间对复合板微观结构和结合强度的影响。钢层的再结晶在525℃开始，600℃结束。随着退火温度的升高，原始钢板表面经过刷磨处理的复合板的剥离强度先增加后降低，这是由于机械锁定和冶金结合的竞争所致。退火后，冷轧复合过程中在加工硬化的钢表面层与其基体之间形成的裂纹仍然存在。在相同退火条件下，与经过刷磨处理的钢表面的冷轧复合复合板相比，经过抛光盘处理的钢表面的冷轧复合复合板具有更少的界面缺陷、更高的结合质量、更高的界面Al和Fe原子扩散速率以及更大的冶金结合程度，这有助于缩短退火时间、降低能耗并提高生产效率。
