多年来,我厂生产墨球铸铁曲轴的正火工艺为920±10℃保温2h,炉冷至880±10℃保温0.5h,出炉吹风或喷雾冷却,然后在560±10℃回火2h,出炉空冷。为了改进这一工艺,我们进行了一些试验。其铸态化学成分及金相组织见表1。试验件在 RJX-30-9箱式电阻炉内加热,风扇吹风冷却,用不同正火工艺处理后的机械性能试验结果如表2所示。 Over the years, my factory production of nodular graphite cast iron crankshaft normalizing process 920 ± 10 ℃ insulation 2h, furnace cooling to 880 ± 10 ℃ insulation 0.5h, baked or spray cooling, and then tempered at 560 ± 10 ℃ 2h, baked Air-cooled. In order to improve this process, we conducted some experiments. The cast chemical composition and microstructure shown in Table 1. Test pieces in the RJX-30-9 box-type resistance furnace heating, fan cooling, with different normalizing process after the mechanical properties of the test results shown in Table 2.