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Vermicular graphite cast iron vermicular effect multi-feature-point thermal analysis evaluation method

An evaluation method and technology of vermicular graphite cast iron, applied in the field of metallurgy and casting, can solve the problems of difficult to control and monitor the O content accurately, and achieve good evaluation effect and rapid evaluation effect.

Pending Publication Date: 2020-07-10
HARBIN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, the S content in the raw molten iron can be controlled by the quality of the charge, while the O content is difficult to accurately control and monitor.

Method used

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  • Vermicular graphite cast iron vermicular effect multi-feature-point thermal analysis evaluation method
  • Vermicular graphite cast iron vermicular effect multi-feature-point thermal analysis evaluation method
  • Vermicular graphite cast iron vermicular effect multi-feature-point thermal analysis evaluation method

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Embodiment 1

[0023] Embodiment 1 A kind of multi-feature point thermal analysis evaluation method of vermicular effect of vermicular graphite cast iron, described evaluation method comprises the following steps:

[0024] Step 1: Extract multiple feature points on the thermal analysis cooling curve of the creeping inoculated molten iron sample under production conditions;

[0025] Step 2: Set up a multi-characteristic point combination vector representation model of the ideal molten iron creeping metallurgical state;

[0026] Step 3: Comparing the multiple feature points under the production conditions of step 1 with the combination vector of multiple feature points in the ideal state of step 2;

[0027] Step 4: Determine the comparison approximation coefficient S through the comparison in step 3, which is used to predict the actual creeping effect of molten iron.

[0028] Further, the step 2 is specifically that the characterization model is:

[0029] [T Max ,T L ,T N , (dT / dt) N ,T ...

Embodiment 2

[0035] Establishment of characteristic point vector model for thermal analysis of ideal molten iron creeping metallurgical state characterization. Under the actual production conditions of a vermicular graphite cast iron foundry, samples of thermal analysis cooling curves of vermicular molten iron were collected. The composition control range of the vermicular molten iron was C: 3.7-3.8; Si: 2.0-2.4; Mn: 0.3-0.5; P:≤0.05; S:0.01~0.02; Cu:0.3~0.6; Sn:0.02~0.04; Mg:0.01~0.02; RE:0.01~0.02. Use a resin sand sample cup with an inner cavity size of Φ30×50mm and a wall thickness of 5mm for thermal analysis, and extract the maximum test temperature T on the cooling curve Max , liquidus temperature T L , eutectic nucleation temperature T N , Cooling rate of eutectic nucleation point (dT / dt) N , the lowest eutectic temperature T EU , Maximum eutectic recovery rate temperature T E , maximum eutectic recovery rate (dT / dt) E , the highest eutectic recovery temperature T ER , Solidi...

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Abstract

The invention discloses a vermicular graphite cast iron vermicular effect multi-feature-point thermal analysis evaluation method. The method comprises the following steps: 1, extracting a plurality ofcharacteristic points from a thermal analysis cooling curve of a vermicular inoculation molten iron sample under a production condition; 2, building an ideal molten iron vermiculization metallurgicalstate multi-feature-point combination vector representation model; 3, comparing the plurality of feature points under the production condition in the step 1 with the plurality of feature point combination vectors in the ideal state in the step 2; and 4, determining an approximation coefficient S through comparison in the step 3 so as to predict the actual vermicularizing effect of the molten iron. The method is a rapid and efficient characteristic point thermal analysis method and is used for evaluating the actual metallurgical state of the molten iron.

Description

technical field [0001] The invention belongs to the field of metallurgy and casting, and in particular relates to a multi-characteristic point thermal analysis and evaluation method for the vermicular effect of vermicular graphite cast iron. Background technique [0002] The primary crystallization form of graphite in cast iron is related to the metallurgical treatment state of molten iron. Vermicular graphite cast iron contains insufficient Mg and RE spheroidizing elements, so the O and S surface active elements in molten iron cannot be completely removed. Vermicular graphite grows alternately in a-direction and c-direction, which is between spherical and flake graphite. Due to the purification effect of Mg treatment, it cannot completely rely on inoculation to reduce the tendency of supercooling. Therefore, the nucleation conditions of vermicular graphite cast iron are similar to that of ductile iron, and the graphite tip grows in contact with molten iron, so the growth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20C22C37/10
CPCG01N25/20C22C37/10
Inventor 石德全姜爱龙刘泽宇徐振宇李娜娜刘庆义高桂丽
Owner HARBIN UNIV OF SCI & TECH
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