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我厂生产的175F汽油机弹簧支承座(见图1)材料为45~#钢,要求HRC28～34。原热处理采用正常工艺:840±10℃加热淬火、回火。处理后磁力探伤微裂纹工件占40～60％。裂纹呈放射状。
I plant 175F gasoline engine spring seat (see Figure 1) material is 45 ~ # steel, HRC28 ~ 34 required. The original heat treatment using normal technology: 840 ± 10 ℃ heating quenching and tempering. After processing the magnetic detection of micro-cracks 40-60% of the workpiece. Cracks were radial.