Connecting rod material for engines in powder metallurgy and preparation method thereof

An engine connecting rod and powder metallurgy technology, which is applied in the field of iron-based powder metallurgy engine connecting rod materials and its preparation, can solve the problems of inability to obtain large-scale industrial applications, high raw material and manufacturing costs, and difficulty in achieving fatigue cycles, and achieve Effect of improving hot workability, high strength and hardness, and stable fatigue life

Inactive Publication Date: 2011-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the performance development trend of high power, low fuel consumption, low vibration and low noise of automobile engine requires to reduce the mass of connecting rod. Titanium alloy and aluminum and magnesium metal matrix composite materials can effectively reduce the mass of connecting rod, but the high cost Raw materials and manufacturing costs make it impossible to obtain large-scale industrial applications, and iron-based materials have become the preferred material for preparing connecting rods because of their good cost performance
The current fatigue cycles of iron-based connecting rod materials are difficult to reach more than 5 million times, and there are disadvantages of complicated preparation process and high processing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mo0.5%, Cr0.5%, Mn0.5%, Si0.5%, Ni1.5%, Cu1.0%, C 0.4% by weight percentage, the balance is mixed after Fe ingredients; pressing, pressing pressure 300MPa; sintering, sintering temperature 1000°C, sintering holding time 1.5 hours; precision die forging, heating temperature 900°C, holding time 20 minutes, forging pressure 150kg; quenching temperature 780°C, holding time 20 minutes, tempering temperature 500°C, The heat preservation time is 50 minutes. The final performance of the material is: density 7.62g / cm 3 , tensile strength of 1066 MPa, yield strength of 610 MPa, symmetrical cyclic tensile fatigue strength of 350 MPa, stable fatigue life of 5 million cycles.

Embodiment 2

[0017] Mo0.8%, Cr0.9%, Mn0.9%, Si06%, Ni1.8%, Cu1.2%, C 0.5% by weight percentage, and the balance is mixed with Fe after batching; pressing, pressing pressure 350MPa; Sintering, sintering temperature 1150°C, sintering holding time 2.5 hours; precision die forging, heating temperature 1100°C, holding time 30 minutes, forging pressure 180kg; quenching temperature 800°C, holding time 30 minutes, tempering temperature 550°C, holding time 60 minutes. The final performance of the material is: density 7.65g / cm 3 , The tensile strength is 1100MPa, the yield strength is 650MPa, the symmetrical cyclic tensile fatigue strength is 360 MPa, and the fatigue life is stable up to 5 million cycles.

Embodiment 3

[0019] Mo1.0%, Cr1.1%, Mn1.2%, Si0.6%, Ni2.0%, Cu1.5%, C0.7% by weight percentage, the balance is mixed after Fe ingredients; pressing, pressing pressure 350MPa; sintering, sintering temperature 1300°C, sintering holding time 2.5 hours; precision die forging, heating temperature 980°C, holding time 40 minutes, forging pressure 220kg; quenching temperature 900°C, holding time 30 minutes, tempering temperature 600°C, The heat preservation time is 60 minutes. The final performance of the material is: density 7.76g / cm 3 , tensile strength 1320MPa, yield strength 728MPa, symmetrical cyclic tensile fatigue strength 360 MPa, stable fatigue life of 5 million cycles.

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Abstract

The invention discloses a connecting rod material for engines in powder metallurgy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 0.5-1.5% of Mo, 0.5-1.5% of Cr, 0.5-1.0% of Mn, 0.5-1.0% of Si, 1.5-2.0% of Ni, 1.0-2.0% of Cu, 0.4-0.8% of C and the balance of Fe. The preparation method comprises the following steps: mixing, rolling, sintering, carrying out fine die forging, quenching and tempering. The forging density of the material is greater than 7.6g / cm<3>, the tensile strength is greater than 1060 MPa, the yield strength is greater than 600 MPa, the symmetrical cyclic tensile fatigue strength is greater than 350 MPa, and the fatigue life is stably 5 million revolutions.

Description

technical field [0001] The invention relates to a powder metallurgy engine connecting rod material and a preparation method thereof, in particular to an iron-based powder metallurgy engine connecting rod material and a preparation method thereof. Background technique [0002] As an advanced manufacturing technology, powder metallurgy has many advantages such as energy saving, high efficiency, material saving and environmental protection. The continuous development of the automobile industry has brought excellent opportunities for my country's powder metallurgy products industry. With the increasing technical content of automobiles, the technical level of powder metallurgy products for automobiles is also improving, and the proportion of powder metallurgy parts with high performance (high strength, high precision, etc.) and complex shapes continues to increase. The connecting rod is the main part of the automobile engine, and its quality directly affects the overall performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C33/02C21D8/00
Inventor 周科朝刘芳李志友
Owner CENT SOUTH UNIV
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