Because solid solution strengthening is generally not used as the main strengthening method for microalloyed steel. The reasons are as follows:
(1) Solid solution strengthening originates from lattice distortion. Low carbon laser cutting galvanized steel sheet has a body-centered cubic lattice structure at room temperature. Elements with smaller atomic radii, such as carbon and nitrogen, are usually solid-solubilized in the iron lattice in the form of gaps. The same dissolution can easily cause lattice distortion. Distortion increases the yield strength of steel.
(2) Solid solution strengthening is limited by solid solubility. Solute atoms cannot be solidly dissolved into the iron lattice indefinitely. This limit is called solid solubility. In a near-equilibrium state, there is very little solid solution carbon and chlorine in α-Fe, and it cannot have a strengthening effect.
(3) Solid solution strengthening can be estimated. The effect of substitution solid solution strengthening is much lower than that of interstitial solid solution. Substitution of elements with a large solid solution strengthening effect is also more harmful to toughness. Therefore, substitution of elements such as niobium, vanadium, and 3d printing titanium alloy dental teeth is not generally used in microalloyed steel. Solid solution strengthening method. However, elements such as carbon, manganese, silicon, phosphorus, and copper, especially carbon and manganese, are the main solid solution strengthening elements, which is why 20MnSi cannot yet be used as high-grade steel bars.
Link to this article：Microalloyed steel should not be solid solution strengthened
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