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我厂生产的精铸件本体毛坯,材料为ZG2Cr13。毛坯重200克。对铸态毛坯逐件磁力探伤,发现有一种浅而细的裂纹;该裂纹在尔后的调质热处理时会明显的扩大,目视就能看清。试生产初期裂纹废品率达60％,随后采取了一系列的措施。例如,把铸件的内尖角改为较大的圆弧过渡;在炉料中增加新料的比例,甚至全用新料;快速熔炼;在
I plant the casting cast rough, material ZG2Cr13. Billet weight 200 grams. On the as-cast blank piece by piece of magnetic detection, found a shallow and thin cracks; the crack in the heat treatment after the tempering will be significantly expanded, visual can see. Trial production early crack scrap rate of 60%, followed by a series of measures. For example, the casting of the tip angle to a larger arc transition; in the charge to increase the proportion of new materials, and even all new materials; rapid melting; in