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行业内普遍认为:浸液淬火时,同一工件上具有相同有效厚度的部分能获得大致相同的淬火冷却效果。我们把这一认识简称为行业内的“有效厚度观念”。今有两个不同形状的试样,如图14所示。一个是Φ20mm×70mm的圆柱,且两端都加工成了半球形,称之为圆头试样。另一个是20mm×20mm×70mm的长方体,称之为方形试样。无疑,方形试样比圆头试样稍大。图中的阴影区是方形试样多出的部分。按照有效厚度观念,方形试样不会比圆头试样冷却得更快。
It is generally accepted in the industry that when immersion quenching, approximately the same quench cooling effect is obtained for the same work piece having the same effective thickness. We simply refer to this understanding as the industry’s “concept of effective thickness.” There are two samples of different shapes, as shown in Figure 14. One is Φ20mm × 70mm cylindrical, and both ends are processed into a hemispherical shape, called the round head sample. The other is a 20mm × 20mm × 70mm rectangular box, called a square sample. No doubt, the square sample is slightly larger than the round sample. The shaded area in the figure is the extra part of the square specimen. According to the concept of effective thickness, the square sample will not cool faster than the round sample.