Wear-resistant component and method for producing the same

Patent metadata

Field	Value
Publication number	US-10835958-B2
Application number	US-201716089332-A
Country	US
Kind code	B2
Filing date	May 15, 2017
Priority date	May 17, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A tooth, which is a wear-resistant component, includes a core, and a body made of a first metal and disposed to enclose the core. The core includes a matrix made of a second metal, first hard particles dispersed in the matrix, and a hard structure extending from the corresponding first hard particle in a direction along the grain flow in the body, the hard structure being higher in hardness than the matrix.

First claim

The invention claimed is:

1. A wear-resistant component comprising:
a body made of a first metal; and
a core enclosed by the body, the core extending in a direction along a grain flow in the body, the core including:
a matrix made of a second metal that is a sintered body,
a plurality of first hard particles dispersed in the matrix, and
a hard structure extending from a corresponding first hard particle of the plurality of first hard particles in the direction along the grain flow in the body, the hard structure having a greater hardness than a hardness of the matrix, the hard structure including an element constituting the first hard particle of the plurality of first hard particles.

2. The wear-resistant component according to claim 1 , wherein the first metal is steel.

3. The wear-resistant component according to claim 1 , wherein the second metal is steel.

4. The wear-resistant component according to claim 1 , further comprising an overlay in contact with the body and covering a covered region, the covered region being a part of a surface of the body,
wherein, in an overlay edge portion corresponding to a boundary between the covered region and an exposed region other than the covered region on the surface of the body, the exposed region and a surface of the overlay are flush with each other and form a forged surface.

5. The wear-resistant component according to claim 4 , wherein the overlay includes:
a base matrix made of a third metal, and
a plurality of second hard particles dispersed in the base matrix.

6. The wear-resistant component according to claim 5 , wherein the plurality of second hard particles are disposed in an overlay surface region and are embedded in the overlay side by side, the overlay surface region being a region within an average particle diameter of the plurality of second hard particles from the surface of the overlay.

7. The wear-resistant component according to claim 6 , wherein the plurality of second hard particles located in the overlay surface region are in contact with the surface of the overlay.

8. The wear-resistant component according to claim 6 , wherein a second hard particle of the plurality of second hard particles has a region exposed from the surface of the overlay has an acute central angle corresponding to the region exposed from the surface of the overlay.

9. The wear-resistant component according to claim 5 , wherein in a region including an interface between the overlay and the body, the overlay includes a protrusion that protrudes toward the body.

10. The wear-resistant component according to claim 9 , wherein the protrusion includes at least a part of a second hard particle of the plurality of second hard particles.

11. The wear-resistant component according to claim 1 , wherein:
the wear-resistant component has a tip end, and
the core extends toward the tip end.

12. A method of producing the wear-resistant component of claim 1 , the method comprising:
preparing the body material made of the first metal and having a recess;
filling the recess with raw powders including powder of the second metal and the plurality of first hard particles; and
forming, by hot forging, the body having the recess filled with the raw powders so as to form the core.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Ohishi Masayuki
• Amano Masaharu
• Tanaka Yoshikiyo

Classifications

• E02F9/28

  Small metalwork for digging elements, e.g. teeth {scraper bits (ploughs for agriculture A01B15/00; teeth of harrows A01B23/02)} · CPC title

• C22C38/00

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

• B22F7/00

  Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting {wherein at least one part is obtained by sintering or compression (application of coating layers by use of metal powders, see C23C)} · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F7/08 Primary

  with one or more parts not made from powder {(B22F7/062 takes precedence)} · CPC title