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本文对F176钢中夹杂物的尺寸、组成、类型及其分布做了实验研究。试验结果表明:此钢中的硫化物为第Ⅰ类MnS。氧化物为显微、脆性、内在的复杂氧化物,其组成为CaO-SiO_2-MgO-Al_2O_3。两种夹杂物的尺寸都小于10μm。从锭底到头部,硫化物含量逐渐增加,除头部外,在锭中心和表层硫化物含量较低,锭心到表层的中间区域其含量较高,头部中心区其含量最高。氧化物从锭底到头部呈减少的规律,在锭底部20％处,氧化物含量最高。结合实验条件及其结果,通过理论分析,认为夹杂物在锭中的分布是凝固过程中动力学因素和热力学因素共同作用的结果,其中热对流运动起主要作用。此项研究为改善易切削不锈钢的使用性能提供了依据。
In this paper, the size, composition, type and distribution of inclusions in F176 steel were experimentally studied. The test results show that the sulfide in this steel is class Ⅰ MnS. Oxides are microscopic, brittle, and intrinsically complex oxides consisting of CaO-SiO 2 -MgO-Al 2 O 3. Both inclusions are less than 10 μm in size. From the ingot to the head, the content of sulfide increased gradually. In addition to the head, the content of sulfides was lower in the center and surface of the ingot. The content of sulfides was higher in the middle region between the center of the ingot and the surface and highest in the central region of the head. Oxide from the ingot to the head was reduced law, at the bottom of the ingot 20%, the highest oxide content. According to the experimental conditions and the results, the theoretical analysis shows that the distribution of inclusions in the ingot is the result of the interaction between the kinetic and thermodynamic factors in the solidification process, and the convection movement plays a major role. This study provides a basis for improving the performance of free cutting stainless steel.