Production method of novel austenitic stainless steel kitchen knives and low-carbon high-chromium martensitic alloy powder
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Solution Overview
Problem
Traditional martensitic stainless steel knives suffer from poor anti-corrosion and anti-rust performance, excessive heavy metal precipitation, and unsafe food contact, with existing solutions like plasma fusion and bimetallic welding processes facing issues such as deformation, low cladding efficiency, and high manufacturing costs.
Innovation Solution
A production method using austenitic stainless steel as the base material, combined with a layer of low-carbon high-chromium martensitic alloy powder applied via high-frequency density laser pulse cladding, followed by tempering and a coherent grinding sequence to achieve high hardness and toughness, ensuring good corrosion resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If martensitic stainless steel is used for the cutting edge to achieve high hardness, then the hardness is improved, but the anti-corrosion and anti-rust performance deteriorates
Solution Approach 1:
The patent applies different material properties to different parts of the knife: the cutting edge uses martensitic stainless steel for high hardness, while the knife body uses austenitic stainless steel for excellent anti-corrosion performance. This local differentiation resolves the contradiction between hardness and corrosion resistance.
Solution Approach 2:
The patent creates a composite structure by combining martensitic stainless steel (for hardness) with austenitic stainless steel (for corrosion resistance) in a bimetallic configuration. This composite approach allows both materials to contribute their advantageous properties to the final product.
2Strength
If plasma fusion is used to clad martensitic alloy powder on the cutter body to improve hardness, then the sharpness and durability are improved, but the manufacturing cost increases and the anti-corrosion performance of the base material remains poor
Solution Approach 1:
Instead of cladding the entire cutter body with martensitic powder, the patent selectively applies the hard martensitic layer only to the cutting edge where hardness is needed, while maintaining the corrosion-resistant austenitic base material in the body. This reduces material costs and manufacturing complexity.
3Reliability
If bimetallic welding process is used to weld austenitic stainless steel knife body with high carbon martensitic stainless steel blade to improve anti-corrosion performance, then the anti-corrosion performance is improved, but the product is prone to deformation, air holes and welding cracks
Solution Approach 1:
The patent modifies the welding parameters and process conditions to accommodate the different material properties of austenitic and martensitic stainless steels. By optimizing welding parameters such as temperature, speed, and atmosphere, the patent achieves high-quality welds without deformation or defects.
4Strength
If plasma fusion is used to clad martensitic powder on austenitic stainless steel cutter body to improve hardness, then the hardness is improved, but the cladding efficiency is low and multiple passes are required due to melting point difference
Solution Approach 1:
The patent employs periodic or pulsed plasma energy input during the cladding process, allowing controlled melting and solidification cycles that account for the melting point difference between austenitic steel and martensitic powder. This periodic action enables single-pass cladding with adequate thickness and quality.
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 results in knives with excellent anti-corrosion and anti-rust properties, improved hardness, and long-lasting sharpness, reducing the risk of heavy metal precipitation and enhancing food-grade safety, while also addressing the inefficiencies and costs associated with traditional processes.
Implementation Method 1
cladding low-carbon high-chromium martensitic alloy powder onto the austenitic stainless steel cutter body through a high-frequency density laser pulse cladding process
Implementation Method 2
high-frequency density laser pulse cladding
Implementation Method 3
Tempering treatment: tempering the austenitic stainless steel cutter body
Implementation Method 4
Grinding the knife surface: dividing the knife surface of the austenitic stainless steel cutter body into a cutting edge area, a transition area, and a knife back area
Data Source
AI summary
The production method of the novel austenitic stainless steel kitchen knives and the low-carbon high-chromium martensitic alloy powder of the present invention include providing an austenitic stainless steel knife body. It cladding low-carbon high-chromium martensitic alloy powder on the austenitic stainless steel cutter body through high-frequency density laser pulse cladding process, tempering treatment, cutter face grinding, end face grinding, and edge processing; The invention adopts an austenitic stainless steel cutter body, and then adopts a high-frequency density laser pulsation cladding process to make a low-carbon high-chromium martensitic stainless steel at the cutting edge by plasma electrofusion.