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

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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Example Embodiment

[0035] In the first aspect, the present invention provides a method for preparing an isothermal quenching fireball ink cast iron material, including the following steps:

[0036] S1, casting comprising the following weight percentage of duct iron workpiece: 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 inevitable impurities;

[0037] S2, place the resulting ball ink cast iron workpiece in the gas carburizing furnace, controlling the furnace carbon potential force of 0.6 to 0.7, raising the furnace temperature to 760 ~ 780 ° C, and heat insulation 10 to 12 min; raise the furnace carbon to 0.8 ~ 0.9, then warmed the furnace temperature to the Austrian temperature and insulation;

[0038] S3, immediately conduct isothermal quenching treatment of the balloon cast iron workpiece to obtain an isothermal quenching fireball ink cast iron material.

[0039] Since the heat treatment in step S2 reduces...

Example Embodiment

[0053] Example 1

[0054] The present embodiment includes 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 margin is Fe and inevitable impurities.

[0055] This embodiment provides a method of preparing the above-mentioned type temperature quenching iron cast iron material, comprising the steps of:

[0056] 1. Using a conventional smelting method, the desired raw material is melted into iron water in the induction furnace; the iron water is born in the package, the control temperature is 1420 ° C for casting, and the ductile iron workpiece is obtained after cooling;

[0057] 2. Place the ball ink cast iron workpiece in the gas carburized furnace, warmed up at room temperature to 800 ° C, followed at 800 ° C for 10 min; time temperature temperature above 800 ° C for 40 min, warming and insulation process 0.6;

[0058] 3. Tipping the ball ink cast iron workpiece from 800 ° C to 900 ° C, then heat insulati...

Example Embodiment

[0061] Example 2

[0062] The examples provided in this example include the following components by weight percentage: C: 3.7, Si: 2.8, Mn: 0.35, Cu: 0.8, S: 0.02, P: 0.02, Mg: 0.05, CE: 0.025, the margin is Fe and inevitable impurities.

[0063] This embodiment provides a method of preparing the above-mentioned type temperature quenching iron cast iron material, comprising the steps of:

[0064] 1. Using a conventional smelting method, the required raw materials are melt into iron water in the induction furnace; the iron water is born in the package, the control temperature is 1440 ° C for casting, and the ink cast iron workpiece is obtained after cooling;

[0065] 2. Place the ball ink cast iron workpiece in the gas carburizing furnace, warmed up at room temperature to 780 ° C, and then heat insulation at 780 ° C for 12 min; temperature temperature temperature to 780 ° C for 60 min, temperature and heat transfer during heat transfer 0.7;

[0066] 3. Tipping the ball ink cast iro...

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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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