US 10,245,639 B2 · Powder metallurgy method for making components

Abstract

A powder metallurgy method includes (a) forming a metallic powder into a shape, (b) thermo-mechanically forming the shape into an article having a polycrystalline microstructure, (c) heat treating the article to cause coarsening of the polycrystalline microstructure, and (d) controlling the grain size homogeneity and distribution in the article formed during coarsening in step (c) by selecting the metallic powder in step (a) to include a metallic powder particle size distribution that is truncated on fine and coarse particle size sides, the selected metallic powder particle size distribution reducing abnormal grain growth such that the polycrystalline microstructure coarsens to a predefined target grain size range.

Claims10

Dependent claims

A powder metallurgy method comprising:

(a) consolidating a metallic powder into a shape;
(b) thermo-mechanically forging the shape into an article having a polycrystalline microstructure;
(c) heat treating the article to cause coarsening of the polycrystalline microstructure;
and
(d) controlling the grain size homogeneity and distribution in the article formed during coarsening in step (c) by selecting the metallic powder in step (a) to include a metallic powder particle size distribution that is truncated on fine and coarse particle size sides, the selected metallic powder particle size distribution reducing abnormal grain growth such that grains of the polycrystalline microstructure coarsen and are all within an ASTM grain size number of 4-8.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/563,216Filed 31 Jul 2012

Published

US 2014/0037490 A16 Feb 2014

Granted

2 Apr 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

B22F 3/24
Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted…:…
B22F 1/052
Metallic powder characterised by the size or surface area of the particles: characterised by a mixture of particles of different sizes or by the…
B22F 2003/248
After-treatment of workpieces or articles: thermal after-treatment
B22F 2998/10
Supplementary information concerning processes or compositions relating to powder metallurgy: processes characterised by the sequence of their steps

Powder metallurgy method for making components

Life of this patent

Powder metallurgy method for making components

Life of this patent

Abstract

Claims10