Ni-Based Superalloy Die Lubrication for Low-Corrosion Hot Forging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hot forging using a Ni-based superalloy with a glass-based lubricant at high temperatures is disadvantageous due to oxidative corrosion, which reduces the service life of the die and can lead to shape defects and increased forging load.
Innovation Solution
A method involving a Ni-based superalloy die coated with a glass-based lubricant containing SiO2 as the main component, with a total alkali metal oxide content of 0 to 10.0% to minimize oxidative corrosion, allowing for effective hot forging while maintaining die service life and reducing forging load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a glass-based lubricant is used in hot forging at high temperatures, then the forging load is reduced and workability is improved, but oxidative corrosion occurs between the glass and the die, reducing service life
Solution Approach 1:
The invention changes the chemical composition parameters of the glass-based lubricant by strictly limiting alkali metal oxide content to 0-10 mass%, particularly controlling Na2O and K2O content. This parameter modification reduces the chemical reactivity of the glass lubricant with the Ni-based superalloy die at high temperatures, thereby preventing oxidative corrosion while maintaining the lubricant's effectiveness in reducing forming load during hot forging
Solution Approach 2:
The invention creates a composite lubricant system by combining glass-based lubricant with specific compositional characteristics (low alkali metal oxide content) and applying it to the Ni-based superalloy die surface. This composite approach integrates the lubricating properties of glass with the high-temperature stability of the modified composition, achieving both load reduction and corrosion prevention
2Duration of action of stationary object
If a graphite-based lubricant or boron nitride-based releasing agent is used instead, then oxidative corrosion is prevented and service life is extended, but the forming load increases and workability deteriorates
Solution Approach 1:
The invention modifies the chemical composition parameters of glass-based lubricant by strictly limiting alkali metal oxide content to 0-10 mass%, particularly controlling Na2O and K2O content. This parameter modification reduces the chemical reactivity of the glass lubricant with the Ni-based superalloy die at high temperatures, thereby preventing oxidative corrosion while maintaining the lubricant's effectiveness in reducing forming load during hot forging
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 enables hot forging with reduced oxidative corrosion and extended die service life, ensuring high-temperature mechanical strength and preventing shape defects in large-sized hot forged materials.
Implementation Method 1
a lubricant or a releasing agent is used to reduce the forming load and prevent seizing due to diffusion bonding of the die and forging material
Implementation Method 2
the chemical reaction is caused by volatile substances containing alkali metal components such as alkali borate salts volatilizing from the surface of the molten glass and reacting with the material
Implementation Method 3
a chemical reaction promoting oxidative corrosion between the glass and the die
Data Source
AI summary
Described herein are methods for producing a hot forged material in air using a Ni-based superalloy for the die. Also described herein are methods for producing a hot forged material, by placing on a lower die a material for hot forging, of which part or all of the surface is coated with a glass-based lubricant, and pressing the material for hot forging with the lower die and an upper die, to form a hot forged material, wherein one or both of the lower die and the upper die are made of a Ni-based superalloy, and wherein the surface of the die in contact with the material for hot forging is coated with a glass-based lubricant containing SiO2 as a main component, in which the total content of alkali metal oxides is 0 to 10.0% in mass %.