Preparation technology for nodular cast iron with TRIP (transformation-induced plasticity) effect

A nodular cast iron and preparation process technology, which is applied in the field of nodular cast iron preparation process with TRIP effect, can solve the problems of increasing production costs, etc., and achieve the effects of improving strength, simple equipment, and wide application prospects

Inactive Publication Date: 2013-05-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to ensure sufficient hardenability and prevent the formation of pearlite in the matrix structure, an appropriate amount of total elements must be added, such as Mo, Ni, and copper. The amount of these alloy elements is related to the size of the part. The more alloying elements there are, the higher the production cost will be

Method used

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  • Preparation technology for nodular cast iron with TRIP (transformation-induced plasticity) effect
  • Preparation technology for nodular cast iron with TRIP (transformation-induced plasticity) effect

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Embodiment Construction

[0042] The technical aspects of the present invention will be further described below in conjunction with specific embodiments.

[0043] According to the chemical composition given in Table 1, after spheroidization and inoculation treatment, it is cast into billet, and heat treatment is carried out after machining to remove the surface.

[0044] Table 1 is the mass percent of each composition

[0045] Table 1

[0046] Numbering C Si mn S P Mg margin 1 3.42 2.5 0.18 0.016 0.041 0.047 Fe and unavoidable impurities

[0047] The cast ductile cast iron is kept at 980°C for four hours and then cooled with the furnace to obtain ferrite + graphite structure ductile iron. Then enter the heating furnace at 835°C for 30 minutes, slowly cool with the furnace to 805°C for 5 minutes, quickly cool down to 200°C, 210°C, 220°C, and 230°C at a cooling rate of 40°C for 5 minutes, and then heat at 5°C The heating rate of / S was raised to 280°C, 300°C, 350...

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Abstract

The invention relates to a preparation technology for nodular cast iron with a TRIP (transformation-induced plasticity) effect. The preparation technology can be used for producing a nodular cast iron part, of which the strength of extension is greater than 700MPa, the elongation is 8%, and the product of strength and elongation is greater than 6000MPa%. The cast tissue is a complex phase tissue of ferrite base, bainite, retained austenite, a bit of martensite and graphite, soft ferrite base endows the whole cast with good ductility, hard bainite, distributed in the ferrite base in a complex intertwining manner, serves as a skeleton so as to improve the strength of the cast, a bit of martensite is the hardest phase in the tissue and plays a role in improving the strength of the cast, furthermore, a bit of retained austenite not only improves the ductility of the cast, but also can produce a TRIP effect at room temperature. Therefore, the nodular cast iron with the TRIP effect has better comprehensive property than common isothermal quenching nodular cast iron, improves both the ductility and strength of the cast, and has higher product of strength and elongation.

Description

technical field [0001] This technology involves the preparation process of nodular cast iron with TRIP effect, which mainly involves the preparation of a high-strength, high-rigidity and high-strength ductile iron casting. After high-temperature annealing, the nodular cast iron with complete ferrite + graphite can be obtained through austria. After heat preservation in the critical zone of ferrite and ferrite, it is graded and austempered to obtain a multiphase structure of ferrite matrix + bainite + retained austenite + a small amount of martensite + graphite, which has good strength, hardness and high elongation. Background technique [0002] The appearance of ductile iron (Ductile Iron, DI for short) in the 1950s made the comprehensive performance of cast iron materials close to that of steel. It is based on its excellent performance that it has been successfully used in casting with complex stress, strength, toughness and wear resistance. Auto parts with high performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C21C1/10C21D5/00C21D1/20
Inventor 赵爱民何建国樊红亮唐荻米振莉武会宾赵征志陈银莉
Owner UNIV OF SCI & TECH BEIJING
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