High-strength-toughness isothermal quenching ductile iron as well as production method and application thereof

A isothermal quenching ductile iron and isothermal quenching technology, applied in the field of warm quenching ductile iron, can solve problems such as being unfavorable to industrial production, restricting the wide application of isothermal quenching ductile iron, etc., achieve excellent comprehensive mechanical properties, improve as-cast microstructure, low content effect

Active Publication Date: 2013-07-17
辽宁华岳精工股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high content of Ni in austempered ductile iron not only limits the wide application of austempered ductile i

Method used

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  • High-strength-toughness isothermal quenching ductile iron as well as production method and application thereof
  • High-strength-toughness isothermal quenching ductile iron as well as production method and application thereof
  • High-strength-toughness isothermal quenching ductile iron as well as production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Utilize the high-strength and toughness austempering ductile iron provided by the invention to make a Y-shaped sample. The cross-section of the Y-shaped sample is trapezoidal, and the geometric dimensions are 32 (16) mm wide x 130 mm long x 60 mm high.

[0042] ①Casting of ductile iron castings: The maximum thickness of the sample is about 30mm, so as to determine the chemical composition of ductile iron. That is, the content of Mn is determined by Mn0.1(1+L), L is the size factor of the casting when the wall thickness of the casting is greater than 30mm, L=T / 30-1, T is the thickness of the main bearing part of the casting, when the casting is When T is cylindrical, its diameter is taken as T. Among them, the production control range of Mn, Mo and Ni element content is ±0.025%; the remaining elements are controlled within the following range, C3.0~4.0%, Si2.5~3.5%, P2 .

[0043] ②Austempering heat treatment of castings: The sample is heated to 880°C in a box-type resis...

Embodiment 2

[0049] The high-strength and toughness austempering ductile iron provided by the invention is used to produce the crankshaft of a 1.8L passenger car supercharged engine.

[0050] The main dimensions of the crankshaft (as shown in Table 2), the size of the main journal as the largest bearing part of the crankshaft is 60mm.

[0051] Table 21. Main Dimensions of Crankshaft of Turbocharged Engine of 8L Car (mm)

[0052] full length

Spindle diameter

Connecting rod diameter

Radius of gyration

Flange diameter

small head diameter

465

Φ60

Φ55

44

Φ82

Φ32

[0053] The crankshaft production process is as follows:

[0054] ①Casting of nodular cast iron crankshaft: Determine the chemical composition of the crankshaft according to the main shaft diameter of 60mm, that is, determine the Mn content by Mn0.1(1+L), L is the size factor of the casting when the wall thickness of the casting is greater than 30mm, L=T / 30-1, T is the ...

Embodiment 3

[0061] The high-strength and toughness austempering nodular iron provided by the invention is used to produce diesel engine crankshafts.

[0062] The main dimensions of the crankshaft (as shown in Table 4), the main journal, which is the largest bearing part of the crankshaft, reaches 90mm.

[0063] Table 4 The main dimensions of a diesel engine crankshaft (mm)

[0064] full length

Spindle diameter

Connecting rod diameter

Radius of gyration

Flange diameter

small head diameter

650

Φ90

Φ74

58

Φ108

Φ45

[0065] The crankshaft production process is as follows:

[0066] ①Casting of nodular cast iron crankshaft: Determine the chemical composition of the crankshaft according to the main shaft diameter of 90mm, that is, determine the Mn content by Mn0.1(1+L), L is the size factor of the casting when the wall thickness of the casting is greater than 30mm, L=T / 30-1, T is the thickness of the main bearing part of the cast...

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Abstract

The invention discloses a high-strength-toughness isothermal quenching ductile iron as well as a production method and application of the ductile iron and belongs to the technical field of metal material preparation. Mainly based on normal ductile cast iron, the thickness of a main bearing part of a cast is taken as the size factor of the cast, the addition amount of Mn, Mo and Ni elements is limited according to the thickness of the main bearing part, so that the high-strength-toughness isothermal quenching ductile iron suitable for the casts with different wall thicknesses is determined. Under the same quenching degree, alloy elements are effectively reduced, so that the production cost of isothermal quenching ductile iron is remarkably reduced; and therefore, the high-strength-toughness isothermal quenching ductile iron can be widely applied to various metal structure components with large loading and high safety coefficient requirement, and is especially suitable for replacing forged steel to produce car supercharged gasoline engine crankshafts and high-power diesel engine crankshafts.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to a high-strength austempering ductile iron and its production method and application. Background technique [0002] Austempered ductile iron (Austempered Ductile Iron), referred to as austempered ductile iron (ADI), also known as Austenitic ductile iron, has better comprehensive mechanical properties than ordinary ductile iron, especially outstanding bending fatigue performance and high The wear resistance has aroused extensive attention of material scientists and engineering technicians. In the 1970s, austenitic austenitic quenching technology was used to develop high-strength and high-toughness austenitic ductile iron with a tensile strength greater than 1000MPa and an elongation of more than 15%. Austempering ductile iron not only makes up for the weakness of ordinary cast iron, but is superior to cast steel due to its casting performance, heat resistance, c...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C21D1/20F16C3/06
Inventor 张兴国蔡勇贾非张国辉郝海刘恒乐房灿峰孟宪军周秉文张宝昌
Owner 辽宁华岳精工股份有限公司
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