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一、前言生产检验中常遇到钢材出现裂纹的问题。在探索裂纹源时,常根据裂纹及其周围夹杂物的存在,作为裂纹源的依据。一旦找不到夹杂,则寻找别的开裂原因。这种检验方法有时给钢材鉴定带来错误的结论。钢材裂纹与夹杂物有密切的关系。夹杂可引起裂纹,这种夹杂是冶炼过程中产生的。裂纹也可生成夹杂,这是高温氧化的夹杂。裂纹经大气腐蚀还可生成貌似夹杂的氧化锈膜,但它不是夹杂。 1.因夹杂导致的应力集中而引起的裂纹,可在其尾部观察到链串状夹杂沿轧向分布。开裂后的加热过程中,因选择氧化,沿裂纹将生成高温氧化的夹杂。两种来源不同的夹杂混在一起,电子探针无法区分。但不加区分地认为均是产生裂纹的夹杂,将导致错误的结论。
First, the preface Production inspection often encountered the problem of steel cracks. In exploring the source of cracks, often based on the presence of cracks and inclusions around, as a source of cracks. Once you find no inclusions, look for other reasons for cracking. This method of inspection sometimes gives the wrong conclusion to the identification of the steel. Steel cracks and inclusions are closely related. Inclusion can cause cracks, this inclusion is produced during the smelting process. Cracks can also generate inclusions, which are high-temperature oxide inclusions. Cracks by atmospheric corrosion can also generate seemingly mixed oxide film, but it is not mixed. 1. Cracks caused by stress concentration due to inclusion can be observed in the rear of the chain strand inclusions along the rolling distribution. Cracking after the heating process, due to selective oxidation, along the crack will generate high temperature oxidation inclusions. Mixed with two different sources mixed together, the electronic probe can not be distinguished. But indiscriminately believe that they are crack-producing inclusions that will lead to the wrong conclusion.