Polymeric Quenchant Cooling Rate Control for Steel Hardening
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Solution Overview
Problem
Conventional quenching methods for steel hardening, such as water and oil baths, either result in rapid cooling leading to microstructural strain and warpage or slow cooling leading to undesirable film formation, and existing polymer-containing quenchants do not adequately meet the cooling rate and thermal conduction requirements for different types of steels.
Innovation Solution
A polymeric quenchant comprising an inorganic nanoparticle, a water-soluble polymer, and water, with a weight ratio of 0.05-5:1-5:100, which regulates cooling rate and hardening of steels by adjusting the viscosity and thermal conduction, and can include additional functional agents for enhanced properties like anti-corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If water or brine baths are used for quenching steel, then cooling rate is extremely rapid and cost is low, but microstructure becomes strained and susceptible to warpage and cracking
Solution Approach 1:
The patent uses a composite quenchant system combining water-soluble polymer and inorganic salt dissolved in water. The polymer provides viscosity control to moderate cooling rate, while the inorganic salt enhances heat extraction capability. This composite approach achieves intermediate cooling rates that prevent microstructure strain while maintaining quenching effectiveness.
Solution Approach 2:
The patent adjusts specific parameters of the quenchant including polymer concentration (0.1-10% by weight), salt concentration (5-50% by weight), and viscosity (1-100 cP) to optimize cooling rate. By controlling these parameters, the quenchant achieves cooling rates that are rapid enough to harden steel but slow enough to prevent excessive microstructure strain and distortion.
2Reliability
If oil baths are used for quenching steel, then cooling rate is relatively slow and warpage is reduced, but cost increases and flash point risk creates fire hazard
Solution Approach 1:
The patent employs water as the base medium instead of expensive oil, making the quenchant inexpensive and non-flammable. Water is inherently safer with no fire hazard, and the additive system (polymer and salt) is designed to be cost-effective. The quenchant can be easily disposed of or refreshed without the safety concerns associated with oil-based systems.
Solution Approach 2:
By adjusting the polymer and salt concentrations, the patent modifies the thermal properties of the water-based quenchant to achieve cooling rates comparable to oil quenching. The viscosity control through polymer addition slows the cooling rate sufficiently to reduce microstructure strain while maintaining the safety and cost advantages of water-based systems.
3Object-affected harmful factors
If traditional polymer-containing quenchants are used, then safety and disposal features are improved, but cooling rate and thermal conduction do not meet requirements for different types of steels
Solution Approach 1:
The patent creates a composite quenchant by combining water-soluble polymer with inorganic salt in specific proportions. The polymer component controls viscosity to moderate cooling rate, while the inorganic salt component (such as sodium chloride, potassium chloride, or calcium chloride) enhances thermal conduction and heat extraction capability. This composite formulation achieves both safety advantages and adequate cooling performance for various steel types.
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 polymeric quenchant effectively controls cooling rates and hardening of steels, preventing deformation and cracking, while being non-toxic and recyclable, offering improved cooling curve control and steel product properties compared to conventional quenchants.
Implementation Method 1
A polymeric quenchant comprising an inorganic nanoparticle, a water-soluble polymer, and water, wherein a weight ratio of the inorganic nanoparticle, water-soluble polymer and water is about 0.05-5:1-5:100
Implementation Method 2
regulates cooling rate and hardening of steels by adjusting the viscosity and thermal conduction
Data Source
AI summary
A polymeric quenchant. The polymeric quenchant comprises an inorganic nanoparticle, a water-soluble polymer, and water, wherein a weight ratio of the inorganic nanoparticle, water-soluble polymer and water is about 0.05-5:1-5:100. The cooling rate of steel during a quenching process can be adjusted by regulating the components and ratios of the adjusted by regulating the components and ratios of the polymeric quenchant to achieve desirable steel properties.