Characterization of Electroslag Remelted Super Hard High Speed Tool Steel Containing Niobium

Abstract

In this work, thermodynamical equilibria have been calculated for super hard high speed tool steel (HSS), AISI M41 composition belonging to the multicomponent system Fe-C-Cr-W-Mo-V-Co as well as for its three different variant containing niobium. Some temperature-concentration diagram for both class of alloys are presented and calculated quantities (melting and transformations, amount and composition of phases) are compared with experimental data. Effect of niobium and high cooling rate during electroslag remelting on the precipitated carbides were discussed. In this work, the effect of niobium on morphology of carbides secondary hardening temperature and wear rate of investigated HSSs were studied. This work aims to study the effect of niobium as alloying element on precipitated carbides type and shape, in addition to study the effect of precipitated carbides after full heat treatment on secondary hardening and wear resistance for investigated steels.

Visualization Study on the Droplet Evolution Behaviors in Electroslag Remelting Process by Superimposing a Transverse Static Magnetic Field

“…Electroslag remelting (ESR) process is a promising method for the production of high-quality ingots because non-metallic inclusions can be removed efficiently and sounder structure can be obtained during the fabrication of ingots. [1][2][3][4][5] Thus, it is vitally necessary that ESR process is used during the refining process of the special alloys.…”

Influences of the Transverse Static Magnetic Field on the Droplet Evolution Behaviors during the Low Frequency Electroslag Remelting Process

“…Huai WANG, 1) Yunbo ZHONG, 1) * Qiang LI, 1) Wanqin LI, 1) Weili REN, 1) Zuosheng LEI, 1) Zhongming REN 1) and Qiong HE 2) 1) State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, 200072 China. 2) Microelectronic R&D Center, Shanghai University, Shanghai, 200072 China.…”

“…To settle the problem of nonmetallic inclusions damaging the mechanical properties of steels, electroslag remelting (ESR) technology [1][2][3][4][5][6] was developed for its excellent purification efficiency. Nowadays, the ESR process has become more and more important for the increasingly high requirements of the steels in areas such as electricity, aviation, metallurgy, machinery and so on.…”

Thermodynamic Calculation for Silicon ModifiedAISI M2 High Speed Tool Steel

“…The data for all edge binaries with Fe and C, Fe-M, and C-M, as well as for ternaries Fe-C-M (M = metal), are contained in the optimized TCFE database, together with data for other edge binaries and higher-order systems (M1-M2, M1-M2-C, M1-M2-Fe.). All phases in the database are described according to a sub-lattice model [9,10]. Phases other than those in Table 1 have not been considered as possible stable phases in the calculations performed here, since they have not been reported in real high-speed-steel alloys.…”