Furnace-front quick evaluation method of structure and performance of gray cast iron

A technology of microstructure performance and gray cast iron, which is applied in the field of rapid evaluation of the microstructure and performance of gray cast iron before the furnace, can solve the problems of increasing difficulty and the role of subjective factors, and achieve the effect of avoiding human factors and strong self-adaptation

Active Publication Date: 2014-09-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the analysis of differential curves and cooling curves requires very professional knowledge, which increases the difficulty of analysis and the role of subjective factors.

Method used

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  • Furnace-front quick evaluation method of structure and performance of gray cast iron
  • Furnace-front quick evaluation method of structure and performance of gray cast iron
  • Furnace-front quick evaluation method of structure and performance of gray cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The industrial frequency induction furnace is used to smelt molten gray cast iron, and the cast iron grade is HT250. The ingredients are cast pig iron, scrap steel, reclaimed materials, and intermediate alloys; the tapping temperature is 1460-1480°C, 0.25% of SiFe alloy is added to the tapping trough to inoculate with the flow, and the pouring temperature fluctuation range is controlled at 60°C. The thermal analysis sample cup is used to collect the cooling curve of gray cast iron during solidification, and at the same time, the composition test block used by the spectrometer, the round bar sample for testing mechanical properties and the microstructure analysis sample are cast.

[0085] Figure 4 The solidification section of the two relatively similar cooling curves of gray cast iron in Example 1 has a comprehensive deviation Cd of 2.17°C.

[0086] Figure 5 It is the metallographic structure corresponding to the two gray cast iron cooling curves with the integrated deviat...

Embodiment 2

[0089] The industrial frequency induction furnace is used to smelt molten gray cast iron, and the cast iron grade is HT250. The ingredients are cast pig iron, scrap steel, reclaimed materials, and intermediate alloys; the tapping temperature is 1460-1480°C, 0.25% of SiFe alloy is added to the tapping trough to inoculate with the flow, and the pouring temperature fluctuation range is controlled at 60°C. The thermal analysis sample cup was used to collect the cooling curves of the molten iron at the end of the inoculation treatment steel and the end of the incubation treatment for a long time, and the microstructure analysis samples were cast at the same time.

[0090] Image 6 These are two solidified sections of gray cast iron cooling curves with large differences in Example 2, which are the cooling curves corresponding to good and poor inoculation.

[0091] Figure 7 It is the metallographic structure corresponding to the cooling curve corresponding to good inoculation (A) and poo...

Embodiment 3

[0094] The industrial frequency induction furnace is used to smelt molten gray cast iron, and the cast iron grade is HT250. The ingredients are cast pig iron, scrap steel, reclaimed materials, and intermediate alloys; the tapping temperature is 1460-1480°C, 0.25% of SiFe alloy is added to the tapping trough to inoculate with the flow, and the pouring temperature fluctuation range is controlled at 60°C. The thermal analysis sample cup was used to collect 30 cooling curves of gray cast iron during solidification, and at the same time, round rod samples for testing mechanical properties and microstructure analysis samples were cast.

[0095] Figure 8 It is the relationship between the comprehensive deviation value Cd and the percentage difference of type A graphite in Example 3.

[0096] Picture 9 It is the relationship between the comprehensive deviation value Cd and the difference in tensile strength in Example 3.

[0097] Picture 10 It is the relationship between the comprehensi...

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Abstract

The invention discloses a furnace-front quick evaluation method of structure and performance of gray cast iron in the technical field of steel casting and computer signal processing, and is used for solving the problems existing in furnace-front quick comprehensive evaluation research on the structure and performance of gray cast iron in a casting process. The method is mainly characterized by performing furnace-front acquisition on a cooling curve of gray cast iron in a thermal analysis sample cup of which the size is fixed, then, extracting an effective solidification segment of the cooling curve, and characterizing a melt state of cast iron by the integral shape of the effective solidification segment of the cooling curve. The new furnace-front quick evaluation method of structure and performance of gray cast iron, effectively provided by the invention, is high in self-adaptability and can avoid human factors; the method is used for setting up a database and adding new standard samples at any time, is relatively high in flexibility and is in favor of improving the yield of casting pieces.

Description

Technical field [0001] The invention relates to the technical field of steel casting and computer signal processing, in particular to a method for quickly evaluating the structure and properties of gray cast iron before furnace. Background technique [0002] The state of cast iron melt mainly refers to the state of temperature, chemical composition content and component elements in the liquid metal. Under the premise of fixed temperature, chemical composition and content, the presence of component elements in the melt is mainly affected by factors such as the raw materials used for smelting, the composition and structure of the master alloy used for melt processing, the smelting method, and the smelting process. The state of the cast iron melt changes dynamically with time based on the composition and temperature of the molten iron, and the difference in the state of the melt will inevitably affect the performance of the casting. In the equilibrium state, the effects of the abov...

Claims

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Application Information

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IPC IPC(8): G01N33/12G01N25/02G01N3/00
Inventor 李言祥陈祥
Owner TSINGHUA UNIV
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