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Metal bar continuous zone smelting and solidification grain-refining process

A technology of metal rods and continuous regions, which is applied in the field of continuous region melting and solidification of metal rods, can solve the problems of high melting point alloys, achieve fast heating speed, convenient operation, and eliminate macro segregation and shrinkage porosity Effect

Inactive Publication Date: 2005-09-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing work in this field is mainly concentrated on low-melting point alloys that are convenient for experimental research. There are still many difficulties in the research on high-melting point alloys, and there has not been a simple and easy method.

Method used

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  • Metal bar continuous zone smelting and solidification grain-refining process

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: A cast iron rod with a diameter of d=20mm is processed, and its chemical composition and weight percentage content (%) are: C 4.10, Si 1.92, Mn 0.22, P 0.058, S 0.023 Fe balance. Use a high-frequency heating power supply with power of P=15kW and high-frequency electromagnetic frequency f=100KHz, the temperature in the melting zone of the cast iron rod is 1250°C, the descending moving speed of the rod is v=0.2mm / s, and the pulse current parameters are current peak value I= 500A, pulse frequency f'=4000Hz, output voltage U=80V.

[0015] Carry out specific operations according to the arrangement of the attached drawings. Continuous zone melting and continuous solidification are adopted. The zone melting starts from one end of the cast iron rod 1, and then the rod 1 and the induction heating coil 3 are relatively moved through the movement mechanism C, so that the melting zone 2 of the rod 1 gradually moves to the other end. , and gradually complete the melti...

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Abstract

The present invention provides one kind of continuous metal bar zone refining and crystal fining process, and belongs to the field of metal material heat processing technology. The present invention features that the descending or ascending metal bar is made to pass through induction heating system for continuous zone smelting, while pulse current is applied to the metal bar via the pulse power source connected to the ends of the metal bar, with pulse current frequency being 1-10 KHz, applied voltage 50-1000 V, current peak value 50-5000 A, metal bar diameter 5-100 mm and moving rate of the metal bar 0.1-10 mm / s.

Description

technical field [0001] The invention relates to a method for continuous zone melting and solidification of metal rods, which belongs to the thermal processing of metal materials [0002] technology field. Background technique [0003] In the field of material science, controlling the solidification process of metal materials is an important way to improve the performance of metal engineering materials and castings and to develop new materials. Especially for high-melting point metals, the production process is complex and very difficult. In addition, for brittle metals, the structure cannot be improved and refined by means of pressure processing. Therefore, it is of great significance to study metal solidification control technology, improve its solidification structure, reduce macro-segregation, eliminate cracks, and improve the quality of slab. [0004] The traditional method is solidification and fine-grain technology based on chemical treatment. With the rapid develop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/02C22B9/02
CPCY02P10/20Y02P10/25
Inventor 翟启杰范金辉李仁兴陈宇刘立强华勤李祖齐侯旭富知愚
Owner SHANGHAI UNIV
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