Forged component, method for manufacturing the same, and connecting rod

Patent metadata

Field	Value
Publication number	US-10822677-B2
Application number	US-201414762367-A
Country	US
Kind code	B2
Filing date	Mar 18, 2014
Priority date	Mar 20, 2013
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A forged component having a chemical composition including, by mass %, C: 0.30 to 0.45%, Si: 0.05 to 0.35%, Mn: 0.50 to 0.90%, P: 0.030 to 0.070%, S: 0.040 to 0.070%, Cr: 0.01 to 0.50%, Al: 0.001 to 0.050%, V: 0.25 to 0.35%, Ca: 0 to 0.0100%, N: 0.0150% or less, and the balance being Fe and unavoidable impurities, and satisfying formula 1. Metal structure is a ferrite pearlite structure, and a ferrite area ratio is 30% or more. Vickers hardness is in the range of 320 to 380 HV. 0.2% yield strength is 800 MPa or more. A Charpy V-notch impact value is in the range of 7 to 15 J/cm2.

First claim

The invention claimed is:

1. A forged component having a chemical composition consisting of, by mass %, C: 0.30 to 0.45%, Si: 0.05 to 0.35%, Mn: 0.50 to 0.90%, P: 0.030 to 0.070%, S: 0.040 to 0.070%, Cr: 0.01 to 0.50%, Al: 0.001 to 0.050%, V: 0.25 to 0.35%, N: 0.0150% or less, and the balance being Fe and unavoidable impurities, and satisfying the following formula 1:
[C]−4×[S]+[V]−25×[Ca]<0.44  (Formula 1)

wherein [X] means a value of the content (mass %) of an element X),
wherein a metal structure of the forged component is a ferrite pearlite structure, and
a ferrite area ratio is 30% or more;
a Vickers hardness of the forged component is in the range of 320 to 380 HV;
a 0.2% yield strength of the forged component is 800114 Pa or more; and
a Charpy V-notch impact value of the forged component is in the range of 7 to 15 J/cm 2 .

2. The forged component according to claim 1 satisfying the following formula 2:
2.15≤4×[C]−[Si]+(⅕)×[Mn]+7×[Cr]−[V]≤2.61.  (Formula 2)

3. A connecting rod comprising the forged component according to claim 1 .

4. A connecting rod comprising the forged component according to claim 2 .

Assignees

• Aichi Steel Corp
• Toyota Motor Co Ltd

Inventors

• Uenishi Takeyuki
• Owaki Susumu
• Koma Hisanori
• Kitano Tomoyasu
• Tanahashi Kazuhiro
• Shinohara Nobuyuki

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• F16C9/045

  the bearing cap of the connecting rod being split by fracturing · CPC title

• C22C38/00 Primary

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F16C7/023

  for piston engines, pumps or the like · CPC title