Ductile iron before-furnace thermal analysis-eutectic expansion quick detection apparatus and detection method

A detection method and detection device technology are applied in the fields of metallurgy and casting, which can solve the problem of inability to subdivide the spheroidization effect of molten iron, and achieve the effects of reducing the testing cost, facilitating popularization and application, and having a simple structure.

Pending Publication Date: 2017-03-15
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the expansion effect of ductile iron solidification is caused by graphitization expansion, the eutectic expansion is related to the carbon equivalent CE of molten iron, and the eutectic expansion rate alone cannot subdivide the spheroidizing effect of molten iron with different carbon equivalent CE

Method used

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  • Ductile iron before-furnace thermal analysis-eutectic expansion quick detection apparatus and detection method
  • Ductile iron before-furnace thermal analysis-eutectic expansion quick detection apparatus and detection method
  • Ductile iron before-furnace thermal analysis-eutectic expansion quick detection apparatus and detection method

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Experimental program
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Embodiment 1

[0022] Thermal analysis before ductile iron furnace-eutectic expansion hyperbolic rapid detection device, its composition includes: cylindrical dry sand sampler 2, the sampler is composed of a fixed half set 16 and a movable half set flexibly connected by a pretension spring 14 17, the sampler has a vertically placed thermocouple 4 and a horizontally placed expansion rod 7, the thermocouple is used to measure the cooling curve at the thermal node of the molten iron in the sample cup, and one end of the expansion rod It is in contact with the screw 3 on the fixed half sleeve, and the other end is in contact with a measuring rod of a linear displacement sensor 9 for transferring the displacement on the thermal center diameter of the sample. The measuring rod is constrained by a spring 8 which is always in a compressed state, ensuring the tight contact connection between the screw 3, the expansion rod 7 and the measuring rod of the displacement sensor. The invention is used in th...

Embodiment 2

[0024] Thermal analysis before ductile iron furnace-eutectic expansion hyperbola rapid detection method, pour molten iron into the sample cup of the sampler, after the temperature of each part in the sample cup reaches thermal equilibrium, the part of the expansion rod in the sample cup is heated and softened, and at the hot node There is even a slight melting on the surface of the position, but the whole still has enough strength and rigidity to maintain the function of the displacement of the transfer line. The end is connected with the chilled layer and the columnar crystal region of the sample cup wall. The closer the chilled crystallization layer on the expansion rod is to the sample cup wall, the thicker it is and the stronger it is. The chilled layer on the wall of the sample cup and the chilled layer on the wall of the sample cup and the columnar crystal region are tightly covered and integrated. In the subsequent solidification process, the displacement transmitted by ...

Embodiment 3

[0029]Thermal analysis before the furnace of ductile iron described in embodiment 1 or 2-eutectic expansion hyperbolic rapid detection method:

[0030] Taking the cooling-eutectic expansion line displacement hyperbolic detection analysis of typical eutectic ductile iron as an example, the spherical molten iron is poured into the sample cup of the sampler, and the thermocouple measures the temperature of the sample in real time. At this time, the expansion rod itself is heated and expanded. produce significant displacement increments. Maximum test temperature T max After the emergence, the sand mold reaches thermal equilibrium, and then the temperature of the sample begins to drop, and the sample shrinks slightly at this time. The sample reaches the eutectic onset temperature T ES After that, the displacement increases slightly until the eutectic supercooling temperature TE low After the emergence, a large amount of eutectic graphite began to nucleate and grow rapidly, a...

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Abstract

For achieving before-furnace quick evaluation on nodularizing inoculation effect of ductile iron, the invention discloses a novel thermal analysis-eutectic expansion quick detection apparatus and a detection method. The detection apparatus includes: a cylindrical dry moulding sand sampler (2) which is enclosed by a fixed half-sleeve (16) and a movable half-sleeve (17) which are flexibly connected to each other through two pre-loaded springs (14). A K-type thermocouple (4) is vertically arranged and an expansion rod (7) is horizontally disposed in the sampler. The thermocouple measures cooling curve of molten iron in a sample cup at a hot node. One end of the expansion rod is contact-connected to a screw (3) on the fixed half-sleeve, while the other end is contact-connected to a measuring rod of a linear displacement sensor (9) for transmitting linear displacement in the thermal center diameter direction of a test sample. The measuring rod is constrained by a spring (8) which is compressed all the time so as to ensure that the contacted connection between the screw (3), the expansion rod (7) and the measuring rod of the linear displacement sensor to be tight. The device and the method are used in the fields of casting and metallurgy.

Description

technical field [0001] The invention belongs to the inventions and creations in the field of metallurgy and casting, and specifically relates to a nodular iron furnace pre-heat analysis-eutectic expansion hyperbola rapid detection device and detection method. Background technique [0002] The analysis of net volume change during the solidification process of spheroidized molten iron shows that the initial shrinkage occurs in the austenite crystallization zone. After the eutectic reaction occurs, due to the precipitation of spherical graphite, the net volume gradually turns into expansion. Since nodular iron is a eutectic or micro-hypoeutectic composition, the eutectic reaction occupies most of the solidification interval, so the amount and shape of crystalline graphite determine the overall effect of expansion. In the later stage of solidification, the volume expansion of graphite begins to decrease, and then the net volume gradually changes to contraction, and most of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/16
Inventor 李大勇徐振宇马旭梁王利华王言峰
Owner HARBIN UNIV OF SCI & TECH
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