关键词: 16Ni3CrMoE钢, 热处理畸变, 真空渗碳, 等温淬火, 热应力

Abstract: After carburizing and quenching, an aero-engine output shaft made of 16Ni3CrMoE steel was occurred axial length shortening and internal spline deformation, the reasons of which were analyzed. The results show that the main influencing factors of heat treatment deformation are the comprehensive effect of thermal stress and transformation stress generated in the process of carburizing and quenching of the parts. There are differences in the composition of the surface and the core of carburized parts, which makes the stress distribution in the process of heat treatment more uneven and complicated. The heat treatment distortion of the parts is controlled within the process requirements by means of changing the mode of carburizing furnace, reducing the carburizing cooling rate, static oil austempering, adding stabilization treatment before carburizing.

Key words: 16Ni3CrMoE steel, heat treatment distortion, vacuum carburizing, austempering, thermal stress