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在设计零件和制订加工工艺时,要了解所使用的材料,在不同的冷却条件下所获得的表面硬度、硬度沿截面的变化情况(通称U—曲线)以及淬透层深度。一般是根据经验判断,或也可根据钢的端淬曲线(Jominy—曲线),借助布兰切尔图推算出U—曲线,再根据钢的半马氏体硬度求出淬透层深度。这种计算方法是非常麻烦的事。这种计算还必须已知Jominy—曲线,而且仅限于静止油冷和水冷两种情况。如果没有该钢的Jom-
When designing parts and manufacturing processes, understand the materials used, the surface hardness obtained under different cooling conditions, the change in hardness along the cross section (commonly known as the U-curve), and the depth of the hardened layer. Generally, it is determined empirically, or the U-curve can be calculated according to the Brinecker diagram according to the Jominy curve of the steel, and the depth of the hardened layer can be obtained according to the semi-martensite hardness of the steel. This calculation is a very troublesome thing. This calculation must also have a known Jominy-curve and be limited to both stationary oil and water cooling. Without the steel’s Jom-