通过铜钨合金在快速加热后水冷的热冲击实验,研究了材料在热冲击后的力学性能变化.另外,应用有限元方法分析了合金在热冲击过程中的温度及热应力的分布及变化.结果表明,随着热冲击次数的增加,材料的强度减小而韧性明显增加;热冲击中,最大热应力出现在加热及冷却阶段的开始时刻,多次热冲击过程中,材料的内部和外部承受着在拉应力与压应力之间相互转换的交变载荷.
By means of the rapid heating followed by water quenching, thermal shock experiments were conducted for CuW70 alloys to study the variations of mechanical behaviour. On the other hand, the simulation with finite element method was implemented to analyze the variations and the distributions of the temperature and the thermal stresses of CuW70 specimens during thermal shock process. The results show that the strength of CuW70 alloys degenerates and the ductility is improved after repeated thermal shock, and the maximum thermal stress appears at the beginning of heating and quenching period. The alternated thermal stresses which vary between tensile and compression stress will be applied on the internal and the external of CuW70 alloys during repeated thermal shock.
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