化学成分和热处理工艺对转子用403不锈钢组织和性能的影响

Effect of Composition and Heat Treatment on Microstructure and Mechanical and Magnetic Property of 403 Steel for Rotator

用200kg真空感应炉冶炼3炉403不锈钢，锻成Ф120mm圆棒，进行950-1000℃淬火油冷、720-750℃回火油冷的热处理。研究了Ni、N等元素含量及热处理工艺对该钢组织、力学性能和磁性能的影响。试验结果表明，添加Ni，N元素可以显著提高试验钢的力学性能、导磁性能，特别是冲击值等塑韧性指标；添加N元素可以明显提高试验钢在低磁场强度下的磁感应强度，而在高磁场强度下添加Ni元素更加有利。并对Ni，N元素的强化机制也进行了一定探讨，对此类钢在转子部件的应用具有一定的指导作用。

Three 403 steel bars of different compositions were searched, which were produced by 200kg VIM furnace and forged into Ф120mm. Mechanical and magnetic properties were tested after heat treatment 950-1000℃×1h OC＋720-750℃×3h OC. The results show that, 403 steel bar with higher Ni or N has higher strength, magnetoconductivity and toughness especially. Compared with test steel bar with higer Ni, bar with higher N has higher magnetic induction in lower magnetic field intensity, while lower magnetic induction in higher magnetic field intensity. Strengthening mechanism was searched and the conclusion can be made to guide the production of this type steel for rotator.