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一、前言在复杂服役条件下的汽车零件,多用含碳0.25~0.5%的碳素结构钢和合金结构钢制造,经调质处理,获得回火索氏体组织,使零件具有理想的强韧性配合和优良的综合机械性能,以满足使用要求。但有些零件如汽车前轴、连杆、半轴套管等,或因调质处理的周期长、效率低,成为汽车大量流水生产中的薄弱环节;或因调质处理中发生脱碳、变形和裂纹等淬火缺陷,使零件成批报废;或因调质处理后又进行焊接等热加工工艺,致使零件组织性能恶化,产品质量得
I. INTRODUCTION Auto parts under complicated service conditions are mostly made of carbon structural steel and alloy structural steel with carbon content of 0.25-0.5%. After quenching and tempering, the tempered sorbite structure is obtained, so that the part has ideal strength and toughness With well integrated mechanical properties to meet the requirements. However, some parts such as automobile front axle, connecting rod, half-shaft casing, etc., or due to the quenching and tempering of the long cycle, low efficiency, a lot of automotive production flow of the weak link; or quenched and tempered decarburization, deformation And cracks and other quench defects, so that parts scrapped in batches; or quenched and tempered after welding and other thermal processing technology, resulting in deterioration of organizational performance parts, product quality