The effects of different pouring temperature and mold temperature on the hot tearing susceptibility of WE43 magnesium alloy were studied using computer numerical simulation, hot tearing test and differential thermal analysis experiment. The microstructure of the hot tearing zone of the casting was observed using SEM, and the phase composition was analyzed using EDS. Numerical simulation results show that the change in pouring temperature and mold temperature could affect the hot tearing susceptibility (HTS) of WE43 alloy, and the influence of mold temperature was more significant with the conditions of pouring temperature (T_p) of 710–730 °C and mold temperature (T_m) of 240–320 °C. The experimental results are in good agreement with the simulation results. At the lower pouring temperature, the dendrite coherency began at a higher solids fraction, which could enhance the resistance to hot tearing at the end of solidification and reduce HTS of WE43 alloy. At the same pouring temperature, with the increase in the mold temperature, the number of dispersed eutectic phases in the alloy increased obviously, so that hot tearing could be well filled with the eutectic phase to reduce the HTS of WE43 alloy. In experimental conditions, the WE43 magnesium alloy had the lowest HTS at a pouring temperature of 710 °C and a mold temperature of 320 °C.

利用计算机数值模拟，热撕裂试验和差热分析实验研究了不同浇铸温度和模具温度对WE43镁合金热撕裂敏感性的影响。使用SEM观察铸件的热撕裂区的微观结构，并使用EDS分析相组成。数值模拟结果表明，浇铸温度和铸型温度的变化会影响WE43合金的热撕裂敏感性，在浇铸温度（T _p）为710–730°的条件下，铸型温度的影响更为显着。C和模具温度（T _m）在240–320°C之间。实验结果与仿真结果吻合良好。在较低的浇铸温度下，枝晶的相干性从较高的固相分数开始，这可以增强凝固结束时的抗热裂性，并降低WE43合金的高温超导率。在相同的浇铸温度下，随着铸模温度的升高，合金中分散的共晶相数量明显增加，因此热撕裂可以很好地填充共晶相，从而降低WE43合金的高温超导。在实验条件下，WE43镁合金在710°C的浇铸温度和320°C的铸模温度下的HTS最低。