【摘要】 基于A286高温合金抽芯铆钉薄壁圆管退火的工艺要求，建立电磁场和温度场双向耦合的局部感应加热模型，研究电磁场和温度场的分布规律，然后进行了感应退火试验验证。结果表明，导磁体能够有效控制磁力线的分布，使用导磁体能够大幅度提高局部的磁通密度，进而提高加热效率。计算得到的温度梯度明显，表面温度分布曲线表现为两边低中间高的单峰曲线，退火后的硬度分布曲线则表现为两边高中间低的单峰曲线，低硬度区长约3.5 mm。对于退火后薄壁管的组织分布，非退火区呈现冷加工态组织，退火区的再结晶现象明显。更多还原

【Abstract】 Based on the annealing process requirement of thin-walled round tube of A286 superalloy rivet with core-pulling, a local induction heating model with bi-directional coupling of electromagnetic field and temperature field was established to study the distributions of electromagnetic field and temperature field, and then verified by the induction annealing test. The results show that the conducting magnet can effectively control the distribution of the magnetic field lines, and greatly increase the magnetic flux density, then in turn to improve the heating efficiency. The calculated temperature gradient is obvious, and the surface temperature distribution curve is unimodal with the middle high and two sides low, while the hardness distribution curve after annealing is unimodal with the middle low and two sides high, and the length of the low hardness zone is about 3.5 mm. After annealing of the thin-walled tube, the cold working microstructure is retained in the non-annealed zone, while the recrystallization is obvious in the annealed zone.更多还原