Track Link Steel Composition for Wear and Peel Resistance
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Solution Overview
Problem
Existing steel compositions for tracked undercarriage components, despite improving Charpy impact values, fail to adequately enhance peel resistance, leading to insufficient durability improvements in track-type work machines.
Innovation Solution
A steel composition with specific element ranges (0.39-0.45% C, 0.2-1.0% Si, 0.10-0.90% Mn, 0.002-0.005% S, 0.1-3.0% Ni, 0.70-1.50% Cr, 0.10-0.60% Mo, with optional additions of vanadium, niobium, zirconium, titanium, cobalt, and boron) is used, focusing on achieving a hardness of HRC 57 or more and a reduction of area of 40% or more through quenching and tempering, to improve both wear and peel resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the hardness of the component is increased to improve wear resistance, then wear resistance is improved, but toughness of the material is reduced leading to cracking or peeling
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters (carbon: 0.35-0.45%, silicon: 0.15-1.00%, manganese: 0.10-0.90%, sulfur: 0.002-0.005%, nickel: 0.10-3.00%, chromium: 0.70-1.50%, molybdenum: 0.10-0.60%) to achieve a balanced microstructure that provides both high hardness (HRC 50 or more) and high toughness (Charpy impact value of at least 5 kgf·m). This compositional parameter optimization allows the steel to simultaneously achieve wear resistance and resistance to cracking/peeling after quenching and tempering treatment.
Solution Approach 2:
The patent creates a composite microstructure through controlled alloying, where multiple elements work synergistically to form a complex microstructure that combines hard phases (for wear resistance) with tough matrix structures (for crack and peel resistance). The specific combination of carbon, silicon, manganese, nickel, chromium, and molybdenum creates a composite material system that achieves both high hardness and high toughness that cannot be obtained with single-element additions.
2Reliability
If alloy elements are added to improve toughness and achieve high Charpy impact value, then toughness is improved, but the steel composition becomes complex and manufacturing cost increases
Solution Approach 1:
The patent optimizes the parameters of multiple alloying elements simultaneously, establishing specific concentration ranges for each element (carbon: 0.35-0.45%, silicon: 0.15-1.00%, manganese: 0.10-0.90%, nickel: 0.10-3.00%, chromium: 0.70-1.50%, molybdenum: 0.10-0.60%). This multi-parameter optimization approach achieves high Charpy impact values while controlling composition complexity through defined ranges rather than arbitrary additions.
Solution Approach 2:
The patent applies local quality by assigning specific functional roles to different alloying elements based on their positions in the periodic table and their chemical properties. For example, carbon and silicon provide hardenability and base strength, nickel and chromium enhance toughness and corrosion resistance, while molybdenum provides tempering stability. Each element is added in controlled amounts to fulfill its specific local function in the overall microstructure.
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 proposed steel composition significantly enhances the durability of tracked undercarriage components by achieving high wear and peel resistance, extending the life of track links and undercarriage components in track-type work machines.
Implementation Method 1
achieving a hardness of HRC 57 or more and a reduction of area of 40% or more through quenching and tempering
Data Source
AI summary
A steel for a tracked undercarriage component is used as a material constituting a track link (9), for example, and contains: not less than 0.39% by mass and not more than 0.45% by mass of carbon, not less than 0.2% by mass and not more than 1.0% by mass of silicon, not less than 0.10% by mass and not more than 0.90% by mass of manganese, not less than 0.002% by mass and not more than 0.005% by mass of sulfur, not less than 0.1% by mass and not more than 3.0% by mass of nickel, not less than 0.70% by mass and not more than 1.50% by mass of chromium, and not less than 0.10% by mass and not more than 0.60% by mass of molybdenum, with the balance made of iron and unavoidable impurities.