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The analysis of the fracture mechanism of thermal simulation CGHAZ of AHSS DP780: based on response surface method and quantum genetic algorithm
Welding in the World ( IF 2.1 ) Pub Date : 2021-01-13 , DOI: 10.1007/s40194-020-01052-5
Tian Yan , Yong-huan Guo , Xi-ying Fan , Liang Zhang , Chuan-qi Huang , Jin-Yue Zhao

AHSS is widely used in the automobile industry due to its lightweight and high strength. However, the larger carbon equivalent results in poor weldability and causes a severe performance decrease in the performance of the CGHAZ. The thermal simulation was utilized to analyze the fracture mechanism of the CGHAZ of DP780 high-strength steel, and the microstructure and mechanical properties of the CGHAZ were studied by combining the response surface method (RSM) and the quantum genetic algorithm (QGA). Results showed that the predominant fracture type of CGHAZ was a brittle fracture. Meanwhile, the analysis combining energy dispersive spectrometer (EDS) and metallographic showed that the precipitation of carbides, the increase of the content of upper bainite (UB), and the coarse grains were the main reasons for brittle fracture. When the peak temperature, heating rate, and cooling rate were 1100 °C, 60 °C/min, and 1300 °C/min, respectively, the maximum impact energy of CGHAZ was 7.83 J. The results of optimization combining RSM and QGA showed that the impact energy of CGHAZ was increased by 0.7%, and the error between the results of verification and optimization was 1.93%. Therefore, it has positive significance for reducing the brittleness of CGHAZ by adopting lower heat input and slower cooling rate.



中文翻译:

基于响应面法和量子遗传算法的AHSS DP780热模拟CGHAZ断裂机理分析

AHSS的重量轻,强度高,因此在汽车工业中被广泛使用。但是,较大的碳当量会导致可焊接性差,并且会严重降低CGHAZ的性能。利用热模拟分析了DP780高强度钢CGHAZ的断裂机理,并结合响应面法(RSM)和量子遗传算法(QGA)研究了CGHAZ的组织和力学性能。结果表明,CGHAZ的主要骨折类型为脆性骨折。同时,结合能量色散谱仪(EDS)和金相分析表明,碳化物的析出,上贝氏体(UB)含量的增加和粗大晶粒是造成脆性断裂的主要原因。当峰值温度,加热速率和冷却速率分别为1100°C,60°C / min和1300°C / min时,CGHAZ的最大冲击能为7.83J。结合RSM和QGA的优化结果表明CGHAZ的冲击能量提高了0.7%,验证与优化结果之间的误差为1.93%。因此,采用较低的热量输入和较慢的冷却速度对降低CGHAZ的脆性具有积极意义。

更新日期:2021-01-13
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