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在第一讲里我们已经了解热处理时产生裂纹的原因,裂纹的类型和特征以及防止裂纹的重要性。这一讲将进一步分析影响淬火裂纹的主要因素,并在此基础上,结合具体实例介绍各种防止淬火裂纹的方法。一、影响淬火裂纹的因素 1.钢的化学成分的影响: 含碳量是对各种性能影响最大的因素。随着含碳量的提高,淬火钢的断裂抗力会不断下降(图3-1),而产生的淬火应力也随之而增大。因此,对于淬透的工件,含碳量愈高,在淬火时产生纵深裂纹的危险也愈大。试验和生
In the first talk we have learned about the causes of cracks during heat treatment, the type and characteristics of cracks and the importance of preventing cracks. This talk will further analyze the main factors that affect the quenching crack, and on this basis, combined with specific examples of various methods to prevent quenching cracks. First, the factors that affect the quenching cracks 1. The chemical composition of steel: carbon content is the most influential factors of various properties. As the carbon content increases, the fracture resistance of hardened steel will continue to decline (Figure 3-1), and the resulting quenching stress also increases. Therefore, for hardened workpieces, the higher the carbon content, the greater the risk of generating deep cracks during quenching. Test and students