低碳球铁的等温淬火工艺研究

Research of austempering process of low-carbon ductile iron

对低碳球铁的等温淬火工艺进行了研究。测定了低碳球铁件在几种不同奥氏体化时间、等温温度、等温时间下的力学性能,并对金相组织进行了分析。实验结果表明:在900℃奥氏体化40min,340℃进行30min的盐浴处理,能得到σb=1040MPa,δ=3%,ak=42J/cm2,HRC=32的较高的力学性能。

Aiming at the new kind of metal material, low-carbon ductile iron, the technics of austempering has been researched. We measured different mechanical properties, analyzed the microstructure of low-carbon ductile iron at different austenitizing time, austempering temperature, austempering time. Experiment results indicates that when austenitizing at 900℃ for 40min,austempering at 340℃ for 30min,we can obtain a very nice mechanical property, σb= 1040MPa, δ=3%, a k=42 J/cm^2, HRC=32.