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Production process of forced air-cooled full sorbite vermicular graphite cast iron

A technology of compacted graphite cast iron and forced air cooling, which is applied in the production process of forced air-cooled full sorbite type compacted graphite cast iron, can solve the problems of difficulty in batch production and reduced product toughness, and achieve convenient operation, high hardness and low production cost. cheap effect

Active Publication Date: 2019-05-07
锦州捷通铁路机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the special microstructure characteristics of vermicular graphite cast iron materials, the post-heat treatment process of related industries at home and abroad is mainly ordinary annealing, and there are also related reports on bainite austempering treatment. Although bainite austempering is The strength and hardness of the product are greatly improved, but the toughness of the product is significantly reduced. At the same time, it is still difficult to carry out the industrial mass production of the compacted graphite cast iron by the austempering process

Method used

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  • Production process of forced air-cooled full sorbite vermicular graphite cast iron
  • Production process of forced air-cooled full sorbite vermicular graphite cast iron
  • Production process of forced air-cooled full sorbite vermicular graphite cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 (900°C×2h forced air cooling)

[0047] (1) Sample

[0048] The sample material used in the test is vermicular graphite cast iron with ferrite matrix in the original cast state, which meets the requirements of Table 2. The photo of its 1001 times metallographic structure is as follows: figure 2 shown by figure 2 It can be seen that the basic structure is ferrite + 10% coarse flaky pearlite + worm-like graphite.

[0049] (2) Heat treatment operation steps

[0050]First, raise the temperature of the heating furnace to 900±10°C for use. Then bind the vermicular graphite cast iron tensile test rod (size ф20×200mm) with iron wire and put it into the protective box (size 250×150×120mm) and fill it with granular charcoal, push the protective box into the heated In a heating furnace at 900°C, heat at this temperature for 2.0 hours at a constant temperature. After the heat penetration time, take the test rod out of the protective box in the heating furnace at 900...

Embodiment 2

[0058] Example 2 (930°C×2h forced air cooling)

[0059] (1) Sample

[0060] The compacted graphite cast iron workpiece is the ferrite matrix compacted graphite cast iron in the original cast state, and its composition meets the requirements in Table 2.

[0061] (2) Operation steps

[0062] First, raise the temperature of the heating furnace to 900±10°C for use. Then bind various vermicular graphite cast iron workpieces with iron wires and put them into a protective box and fill them with granular charcoal. Put the protective box into the furnace and heat it to 930°C, and heat at this temperature for 2.0 hours. After the heat penetration time, take the vermicular graphite cast iron workpiece out of the protective box in the heating furnace, hang it on the hanger quickly, and the distance between two adjacent workpieces is ≥ 150mm, then start the fan, and the two fans are respectively aligned with the hanging vermicular The direction of the graphite cast iron workpiece is blo...

Embodiment 3

[0070] Example 3 (950°C×2h forced air cooling)

[0071] (1) Sample

[0072] The composition of vermicular graphite cast iron with ferrite matrix in the original cast state of the vermicular graphite cast iron workpiece meets the requirements in Table 2.

[0073] (2) Operation steps

[0074] First, the resistance heating furnace was heated to 900°C for use. Then bundle the vermicular graphite cast iron workpiece with iron wire and put it into a protective box and fill it with granular charcoal. Put the box into the furnace and heat it to 950°C, and heat at this temperature for 2.0 hours. After the heat penetration time, take out various vermicular graphite cast iron workpieces from the protective box in the heating furnace, and quickly hang them on the hanger. The distance between two adjacent workpieces is ≥150mm, and then start the fan, and the two fans are aligned The direction of hanging the vermicular graphite cast iron workpiece is blown against (the air volume is 9500...

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Abstract

Provided is a production process of forced air cooling whole-sorbite type vermicular graphite cast iron. Vermicular graphite cast iron workpieces are contained in a stainless steel protecting box, thestainless steel protecting box is filed with particulate charcoal, and then the stainless steel protecting box is placed into a box type electric furnace heated to be 900 DEG C, and is subjected to constant temperature for 2 hours under the set austenitizing temperature; the vermicular graphite cast iron workpiece subjected to diathermanous treatment for regulated time are fast taken out of the protecting box in the box type furnace, and sequentially hung on a hanging frame in front of the furnace; two draught fans are started to be aligned with the direction of the vermicular graphite cast iron workpieces for opposite blowing, and the cooling speed of vermicular graphite cast iron test rods is controlled to be larger than or equal to 100 DEG C / min; and when the temperature of the vermicular graphite cast iron workpieces subjected to air cooling is 490-500 DEG C, air blowing stops, and after air cooling continues to be performed till room temperature is achieved, and the whole-sorbitetype vermicular graphite cast iron workpieces are obtained. The production process of the forced air cooling whole-sorbite type vermicular graphite cast iron has the beneficial effect of being simplein process, after high-temperature heating forced air cooling heat treatment, a novel vermicular graphite cast iron material with higher mechanical performance is obtained, and the strength, hardnessand the abrasion resistance indexes of the novel vermicular graphite cast iron material should approach or reach more than two times those of the common as-cast vermicular iron.

Description

technical field [0001] The invention belongs to the field of cast iron material preparation, and relates to a production process of forced air-cooled full sorbite type vermicular graphite cast iron, in particular to a special heat treatment method for forced air cooling after high-temperature heating of ordinary vermicular graphite cast iron. Compacted graphite cast iron is transformed into a new type of compacted graphite cast iron material with all sorbite matrix, which has high strength, high hardness and high wear resistance, especially can maintain good impact toughness. Background technique [0002] Vermicular graphite cast iron has strength and toughness similar to nodular cast iron, and also has good casting processability, good thermal conductivity, thermal fatigue resistance and good shock absorption performance similar to gray cast iron, so it has been surpassed in various fields. more and more applications. The microstructure of ordinary vermicular graphite cast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D5/00C22C37/10C22C37/04
CPCC21D5/00C22C37/04C22C37/10
Inventor 谷志刚臧玉郡刘希德李金红蒙赞进马宇
Owner 锦州捷通铁路机械股份有限公司
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