Browse Prior Art Database

STEEL COMPONENT WITH NON-HOMOGENOUS CHEMICAL COMPOSITION AND METHOD OF PRODUCING THE SAME BY MEANS OF ADDITIVE MANUFACTURING

IP.com Disclosure Number: IPCOM000249931D
Publication Date: 2017-May-03
Document File: 6 page(s) / 202K

Publishing Venue

The IP.com Prior Art Database

Abstract

ABSTRACT The present disclosure relates to a steel component with non-homogenous chemical composition throughout the steel component. The non-homogenous chemical composition is obtained through additive manufacturing. Thereby, it is possible to tailor the mechanical properties of different parts of the steel component as desired. After the steel component has been given its intended final shape, it is subjected to a hardening process in order to ensure that the appropriate properties are obtained in each part of the steel component. By means of the process, for example case hardening of steel components can be avoided.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 28% of the total text.

1

STEEL COMPONENT WITH NON-HOMOGENOUS CHEMICAL COMPOSITION AND METHOD

OF PRODUCING THE SAME BY MEANS OF ADDITIVE MANUFACTURING

ABSTRACT

5

The present disclosure relates to a steel component with non-homogenous chemical

composition throughout the steel component. The non-homogenous chemical composition

is obtained through additive manufacturing. Thereby, it is possible to tailor the mechanical

properties of different parts of the steel component as desired. After the steel component

has been given its intended final shape, it is subjected to a hardening process in order to 10

ensure that the appropriate properties are obtained in each part of the steel component. By

means of the process, for example case hardening of steel components can be avoided.

BACKGROUND ART

15

Steel component, for example used as vehicle components, subjected to wear are frequently

subjected to case hardening in order to increase the hardness of the surface of the steel

component while maintaining desired bulk properties of the steel part. Case hardening is

usually performed on a steel component after it has been given its intended final shape, i.e.

after casting and any possible subsequent processing. Case hardening comprises subjecting 20

the steel component to a carbon-rich atmosphere at a high temperature, often above the

austenitisation temperature, thereby infusing additional carbon into a surface layer of the

steel component. Generally, the steel component is subjected to quenching from the high

carburizing temperature in order to provide the steel component with the intended bulk

properties, for example a martensitic structure. 25

The step of subjecting the steel component to the carbon-rich atmosphere at high

temperature is called case carburizing, and the surface layer comprising the additional

carbon is referred to as the “case”. Case depths can range from tenths of millimetre up to

several millimetres, depending on the intended result, which in turn may usually require a 30

carburizing time of between 1 to 48 hours. In addition to an increase in cost, case hardening

may in some cases also lead to undesired changes in the shape of the steel component.

2

For certain components, for example components comprising a blind hole, it may also be

difficult to obtain the desired case depth in semi-closed areas. Moreover, the case depth is

strongly dependent on the local surface/core ratio of the component as the carbon is

diffused from the surface. The tip of a prominent region of the component will therefore 5

likely have a deeper carburising depth than the rest of the component. Considering for

example a gear wheel, the gear tip will have a greater case depth than the root of a gear

flank, while just the opposite is generally desired.

The selection of a steel grade is today made based on the desired or needed mechanical 10

properties of the areas of the steel component which, when in use, will be subjected to the

highest stress. Regions intended to carry significant...