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二、原材料缺陷引起的淬火裂纹这里谈的原材料缺陷是指刀具热处理前存在的一切缺陷,包括钢厂来的冶金缺陷,锻造、设计、机械加工所造成的缺陷。 1.钢中的冶金缺陷和热加工造成的缺陷非金属夹杂物、疏松等缺陷使材料不致密。波兰A·Rutkowska做了非金属夹杂物对淬火裂纹源影响的试验后指出:非金属夹杂物强烈地破坏了钢的连续性,是产生淬火裂纹的起源。另外,缩孔、气孔是应力集中的一些缺口,热处理时容易由此开裂。钢内碳化物不均匀度过高和存在尖角状碳化
Second, quenching cracks caused by raw material defects Here the raw material defects refer to all the defects before the tool heat treatment, including steel to metallurgical defects, forging, design, machining defects. 1. Steel in the metallurgical defects and thermal processing defects caused by non-metallic inclusions, loose and other defects make the material is not dense. Poland A · Rutkowska made non-metallic inclusions on the impact of quenching cracks after the experiment pointed out: non-metallic inclusions strongly destroy the continuity of the steel is the origin of quench cracking. In addition, shrinkage, porosity is a stress concentration of some of the gaps, which can easily be cracked during heat treatment. Inhomogeneous carbide inhomogeneities and presence of sharp-edged carbonization