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Isothermal quenching nodular cast iron material and preparation method and application thereof

A nodular cast iron, austempering technology, applied in metal material coating process, transportation and packaging, coating, etc., can solve the problems of less than 1100MPa tensile strength, high alloy content of nodular cast iron, complex austempering process, etc., to achieve Improve the uniformity of the matrix structure, reduce the stress deformation of the workpiece, and reduce the effect of micro-segregation

Pending Publication Date: 2021-10-15
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ductile iron alloy has high content, complex austempering process, high cost, and when the elongation at break is ≥10%, the tensile strength is less than 1100MPa, which can only meet the requirements of the national standard QTD900-8

Method used

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  • Isothermal quenching nodular cast iron material and preparation method and application thereof
  • Isothermal quenching nodular cast iron material and preparation method and application thereof
  • Isothermal quenching nodular cast iron material and preparation method and application thereof

Examples

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preparation example Construction

[0035] In a first aspect, the present invention provides a method for preparing an austempering ductile iron material, comprising the steps of:

[0036] S1. Casting a ductile iron workpiece including the following weight percentage components: C: 3.6~3.7, Si: 2.1~2.2, Mn: 0.25~0.35, Cu: 0.5~0.8, S<0.02, P<0.04, Mg: 0.025~ 0.05, Ce: 0.025~0.05, the balance is Fe and unavoidable impurities;

[0037] S2. Place the obtained nodular cast iron workpiece in a gas carburizing furnace, control the carbon potential of the furnace gas to 0.6-0.7, raise the furnace temperature to 760-780 °C, and keep it warm for 10-12 minutes; raise the carbon potential of the furnace gas to 0.8-0.7 0.9, then raise the furnace temperature to the austenitizing temperature and keep it warm;

[0038] S3. Immediately perform austempering treatment on the nodular cast iron workpiece to obtain an austempered nodular cast iron material.

[0039] Since the heat treatment in step S2 will reduce the graphite on t...

Embodiment 1

[0054] An austempering ductile iron material provided in this embodiment comprises the following components by weight percentage: C: 3.67, Si: 2.2, Mn: 0.25, Cu: 0.63, S: 0.02, P: 0.04, Mg: 0.025, Ce: 0.05, the balance being Fe and unavoidable impurities.

[0055] The present embodiment provides a method for preparing the above-mentioned austempering ductile iron material, comprising the following steps:

[0056] 1. Using conventional smelting methods, the required raw materials are melted into molten iron in an induction furnace; the molten iron is inoculated by pouring into the ladle, and the temperature is controlled at 1420°C for pouring, and after cooling, nodular cast iron workpieces are obtained;

[0057] 2. Place the ductile cast iron workpiece in a gas carburizing furnace, raise the temperature from room temperature to 800°C, and then keep it at 800°C for 10 minutes; the time from room temperature to 800°C is 40 minutes, and maintain the carbon potential of the furnac...

Embodiment 2

[0062] An austempering ductile iron material provided in this embodiment includes the following components by weight percentage: C: 3.7, Si: 2.1, Mn: 0.35, Cu: 0.8, S: 0.02, P: 0.02, Mg: 0.05, Ce: 0.025, the balance being Fe and unavoidable impurities.

[0063] The present embodiment provides a method for preparing the above-mentioned austempering ductile iron material, comprising the following steps:

[0064] 1. Using conventional smelting methods, the required raw materials are melted into molten iron in an induction furnace; the molten iron is inoculated by pouring into the ladle, controlled at a temperature of 1440°C for pouring, and after cooling, nodular cast iron workpieces are obtained;

[0065] 2. Place the ductile cast iron workpiece in a gas carburizing furnace, raise the temperature from room temperature to 780°C, and then keep it at 780°C for 12 minutes; the time from room temperature to 780°C is 60 minutes, and maintain the carbon potential of the furnace gas dur...

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Abstract

The invention discloses an isothermal quenching nodular cast iron material and a preparation method and application thereof. The preparation method comprises the following steps of firstly, casting a nodular cast iron workpiece comprising the following components in percentage by weight: 3.6-3.7% of C, 2.1-2.2% of Si, 0.25-0.35% of Mn, 0.5-0.8% of Cu, less than 0.02% of S, less than 0.04% of P, 0.025-0.05% of Mg, 0.025-0.05% of Ce and the balance of Fe and inevitable impurities; placing the obtained nodular cast iron workpiece in a gas carburizing furnace, controlling the furnace gas carbon potential to be 0.6-0.7, increasing the furnace temperature to 760-780 DEG C, and heat preservation for 10-12 min; increasing the furnace gas carbon potential increased to 0.8-0.9, then increasing the furnace temperature to the austenitizing temperature, and heat preservation; and immediately carrying out isothermal quenching treatment on the nodular cast iron workpiece to obtain the isothermal quenching nodular cast iron material. The amount of alloy elements in the isothermal quenching nodular cast iron material is small, microsegregation of the elements is reduced, the matrix structure uniformity is improved, the use amount of precious alloy is reduced, the cost is reduced, the strength and toughness of the isothermal quenching nodular cast iron material are remarkably improved, and stress deformation of the workpiece is reduced.

Description

technical field [0001] The invention relates to the field of automobile workpieces, in particular to an austempering ductile iron material and a preparation method and application thereof. Background technique [0002] Cars must improve fuel economy and strictly control emissions. Reducing the weight of cars is an important measure. Every time a car loses 100 kg, it can save 0.3 liters of gasoline per 100 kilometers. Every 10% reduction in car weight can reduce 10% of car emissions. . In order to reduce the weight of the car, it is required that the car castings must be lightweight, thin-walled, precise and tough. [0003] Austempered ductile iron material (ADI) has high strength and ductility. In order to further enhance the overall competitiveness of automobiles, the application of ADI has potential significance in terms of cost reduction, energy saving, and lightweight design. At present, domestic and foreign austempering standards, mechanical performance indicators (te...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/10C23C8/22C21D1/20C21D5/00B62D29/00
CPCC22C37/04C22C37/10C23C8/22C21D1/20C21D5/00B62D29/007
Inventor 袁福安金通康明霍卯田余金科晏克春涂欣达
Owner DONGFENG COMML VEHICLE CO LTD
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