Abstract
Modification of Non-Metallic Inclusions by Rare-Earth Elements in Microalloyed Steels
The modification of the chemical composition of non-metallic inclusions by rare-earth elements in the new-developed microalloyed steels was discussed in the paper. The investigated steels are assigned to production of forged elements by thermo-mechanical treatment. The steels were melted in a vaccum induction furnace and modification of non-metallic inclusions was carried out by the michmetal in the amount of 2.0 g per 1 kg of steel. It was found that using material charge of high purity and a realization of metallurgical process in vacuous conditions result in a low concentration of sulfur (0.004%), phosphorus (from 0.006 to 0.008%) and oxygen (6 ppm). The high metallurgical purity is confirmed by a small fraction of non-metallic inclusions averaging 0.075%. A large majority of non-metallic inclusions are fine, globular oxide-sulfide or sulfide particles with a mean size 17 μm2. The chemical composition and morphology of non-metallic inclusions was modified by Ce, La and Nd, what results a small deformability of non-metallic inclusions during hot-working.
Subject
Metals and Alloys,Industrial and Manufacturing Engineering
Reference19 articles.
1. Control of chemical composition of oxide-sulfide inclusions during deoxidation of steel with manganese, silicon and titanium;J. Wypartowicz;Metallurgy - Metallurgical Engineering News,2006
2. Effect of titanium addition on the formation and distribution of MnS inclusions in steel during solidification;K. Oikawa;ISIJ International,1997
3. Intergranular ferrite nucleation in medium-carbon vanadium steels;F. Ishikawa;Met. Materials Transaction A,1994
Cited by
27 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献