3D-Printed Steel Alloy With Fine Microstructure and High Hardness
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Solution Overview
Problem
Current manufacturing methods for high alloyed materials with high carbon content, such as casting and powder metallurgy, face challenges like coarse microstructures, high energy losses, and difficulty in achieving complex geometries due to long solidification times and the need for subsequent forging or machining, which limits their hardness and mechanical properties.
Innovation Solution
A 3D-printing method using an iron-based alloy with specific compositions of Cr, W, Co, V, and C, where the alloy is processed in an oxygen-low environment with local melting and solidification to achieve a fine microstructure and high carbide distribution, eliminating the need for subsequent forging and machining, and allowing for complex geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If casting followed by forging/rolling is used to produce high alloyed materials, then material purity can be achieved, but solidification time becomes excessively long resulting in coarse microstructures
Solution Approach 1:
The invention changes the solidification parameters by using additive manufacturing technology to solidify the metal powder layer by layer with controlled cooling rates, achieving fine microstructures without long solidification times. The layer-by-layer deposition and controlled thermal cycles transform the solidification process from conventional casting to a precision manufacturing process.
2Manufacturing precision
If conventional casting and forging methods are used, then material purity can be maintained, but energy consumption increases due to multiple heating and forming steps
Solution Approach 1:
The invention merges multiple conventional manufacturing steps (casting, forging, forming) into a single additive manufacturing process. The metal powder is directly deposited and solidified layer by layer to form the final component geometry, eliminating the need for separate heating, forging, and forming operations that consume significant energy.
3Strength
If high alloying is attempted with conventional methods, then material properties can be improved, but the material becomes difficult to forge and roll requiring very high temperatures and loads
Solution Approach 1:
Instead of forming high alloyed materials through conventional forging and rolling at high temperatures and loads, the invention inverts the approach by directly depositing pre-alloyed metal powder in the desired final geometry through additive manufacturing. This eliminates the need to force highly alloyed, difficult-to-form materials through traditional forming processes.
4Shape
If complex geometries are produced using conventional manufacturing, then functional requirements can be met, but additional machining and processing steps are required
Solution Approach 1:
The invention performs preliminary action by directly creating the final complex geometry through additive manufacturing, including internal channels, hollow structures, and optimized topologies that would be difficult or impossible to achieve through conventional manufacturing. The component is built in its near-final form, eliminating subsequent machining and processing steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces a 3D-printed product with enhanced mechanical properties, achieving hardness of at least 1050 HV2 kg and enabling the creation of complex shapes without the need for additional processing steps, while maintaining low oxygen content and high material yield.
Implementation Method 1
melting the powder locally by exposing the powder to an energy beam during a sufficient period of time to form a melt pool
Implementation Method 2
letting the melted powder in the melt pool solidify into a multiphase alloy
Data Source
AI summary
The present invention relates to a 3D-printed iron based alloy product comprising carbon, tungsten, vanadium, cobalt, chromium and molybdenum with very high hardness and very good high temperature properties thermal properties as well as a method of preparing the 3D-printed product and a powder alloy.