High-toughness twinning induced plasticity (TWIP) nodular cast iron alloy and preparation method thereof

A technology of ductile iron and alloy, which is applied in the field of high strength and toughness TWIP ductile iron alloy and its preparation, can solve the problems restricting the application of cast iron, and achieve the effect of improving strength and toughness

Inactive Publication Date: 2011-02-02
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This brittleness severely restricts the applicati

Method used

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  • High-toughness twinning induced plasticity (TWIP) nodular cast iron alloy and preparation method thereof
  • High-toughness twinning induced plasticity (TWIP) nodular cast iron alloy and preparation method thereof
  • High-toughness twinning induced plasticity (TWIP) nodular cast iron alloy and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0026] A high-strength, high-toughness austenite-based TWIP cast iron alloy is prepared by using a high-frequency induction heating melting furnace to carry out smelting, spheroidizing, and inoculating processes in an air environment, and pouring it into a graphite mold; The preparation steps are as follows:

[0027] 1) Loading: Add pig iron, ferrosilicon, graphite, manganese flakes, and nickel raw materials in sequence in the melting crucible, and heat and melt in the atmospheric environment with an ordinary medium-frequency induction melting furnace;

[0028] 2) Smelting: The smelting temperature is controlled at 1600~1700°C, and the holding time is 8-15 minutes. After the liquid metal is melted evenly, add 1.5~2.5% of 5-8 brand rare earth magnesium spheroidizer for spheroidization treatment, and then filter the residue;

[0029] 3) Casting: Pour the smelted liquid into the pre-dried graphite mold through the graphite pouring cap;

[0030] 4) Cooling: After the sample is co...

Embodiment 1

[0036] Using industrial pig iron (1.0% Si, 4.0% C, the rest is Fe, wt%) as the basic raw material, electrolytic nickel with a purity of 99.8%, graphite powder with a purity of 99.8%, electrolytic manganese with a purity of 99.8% and Si 75% ferrosilicon is used as an alloying element added in the inoculation treatment, and the chemical composition is formulated according to the mass fraction (wt%): C3.5%, Mn12%, Ni15%, Si2.5%, rare earth Mg2.0%, S 0.03%, P 0.05%, and the balance is Fe cast iron alloy, which is smelted in an air environment by using a high-frequency induction heating melting furnace. Then the alloy ingot is kept at a high temperature of 950°C for 6 hours for a long time, so that all the carbides in the as-cast structure are dissolved into the matrix austenite, and then rapidly quenched and cooled to obtain a uniform single-phase austenite structure. Strips of a certain thickness are cut from the sample after solution treatment, and rolled into deformed strips of...

Embodiment 2

[0039] On the basis of Example 1, the sample after cold rolling was subjected to high temperature recovery recrystallization, the recrystallization temperature was controlled at 900° C., and the holding time was 60 minutes.

[0040] The mechanical properties of the recrystallized state of the above-mentioned cast iron material are measured as: the material of the present invention is recrystallized through high temperature recovery after cold deformation, and shows better strength and higher elongation under tensile conditions (see Table 1, Figure 5 ), the tensile strength can be increased to 730.81MPa, and the corresponding elongation δ is as high as more than 20%. It is more than 6.7 times that of -3, showing high plasticity, meeting the plasticity requirements of industrial structural materials, and possessing the ability of plastic processing and forming. Image 6 It is the appearance after fracture of the Fe-15Ni-12Mn-3.5C-2.5Si alloy cast iron plate tensile specimen aft...

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Abstract

The invention provides a novel high-toughness austenitic matrix nodular cast iron material which can be cold-rolled and hot-rolled and forged and a preparation method thereof. The high-toughness austenitic matrix nodular cast iron material comprises the following chemical components in percentage by mass: 3.5 to 4.0 percent of C, 8 to 15 percent of Mn, 8 to 15 percent of Ni, 2.0 to 2.8 percent of Si, less than or equal to 0.03 percent of S, less than or equal to 0.05 percent of P, 1.5 to 2.5 percent of rare earth Mg and the balance of Fe. The alloy is prepared through the steps of: smelting, spheroidizing and preparing by adopting a high-frequency induction heating smelting furnace in the air environment; casting and pouring by using graphite; and performing heat treatment, rolling and recrystallization. A finished product can be plastically deformed, and has high toughness.

Description

technical field [0001] The invention belongs to the field of austenite-based ductile iron materials, and more specifically relates to a high-strength TWIP ductile iron alloy and a preparation method thereof. Background technique [0002] As an important engineering structural material, cast iron has been widely used in machine manufacturing. Since the advent of nodular cast iron in the late 1940s, the strength and toughness of cast iron have been improved to a certain extent, but compared with most metal materials, cast iron and its alloys still exhibit high brittleness. So far, there is no cast iron that can be plastically processed, and there is a lack of research reports on plastically processable cast iron at home and abroad. At present, my country's national standards for ductile iron materials GB1348 include QT400-18, QT450-10, QT600-3, QT700-2, QT800-2, QT-H185, QT-H200, etc. At present, cast iron in the world is generally non-deformable. Since there is no cast iron...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C33/10C22C37/04C21D5/00
Inventor 朱定一林淑梅张文杰易韦发杨泽斌
Owner FUZHOU UNIVERSITY
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