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奥氏体不锈钢在工业炉卷轧制的过程中,其表面产生的氧化皮不仅影响产品的表面质量,而且影响后续的酸洗过程。从304奥氏体不锈钢铸坯上取样,利用在THERMORESTOR-W型热-力模拟试验机上开发出的轧制装置及配气系统,进行了模拟工业炉卷轧制过程的试验。结果表明:多道次热轧时试样氧化皮的形成过程为首先形成铁的氧化物,之后在金属基体中形成Cr2O3颗粒状沉淀。随着氧化的不断进行,近基体中的Cr2O3沉淀会变得热力学不稳定,并转变为稳定的FeCr2O4愈合层。随后基体中的Fe向外扩散形成外氧化层,同时氧气向内扩散发生内氧化。以上过程在氧化过程中重复进行,最终形成复杂的层状氧化皮;轧制过程中,层状氧化皮被破坏,氧化后又重新形成,多道次轧制时不断重复以上过程;轧制道次增加时,近基体中形成连续的愈合层所需时间减少。
Austenitic stainless steel in the industrial furnace roll rolling process, the surface of the scale produced not only affect the surface quality of the product, but also affect the subsequent pickling process. Samples were taken from a 304 austenitic stainless steel slab and the simulation of the industrial furnace coil rolling process was carried out using a rolling device and a gas distribution system developed on a THERMORESTOR-W thermo-mechanical simulator. The results show that the formation of oxide scale of the sample during multi-pass hot rolling is the formation of iron oxide and the formation of granular Cr2O3 particles in the metal matrix. As oxidation progresses, the Cr2O3 precipitate in the near-matrix becomes thermodynamically unstable and transforms into a stable healing layer of FeCr2O4. Then the matrix of Fe outward diffusion to form the outer oxide layer, while oxygen inward diffusion occurs within the oxidation. The above process is repeated during the oxidation process to form a complex layered oxide scale. During the rolling process, the layered scale is destroyed and reformed after being oxidized, and the above process is repeatedly repeated during the multi-pass rolling. The rolling track As the times increase, the time required to form a continuous healing layer in the matrix decreases.