热轧变形对高碳TWIP钢组织缺陷和力学性能的影响

为解决高碳Fe-20Mn-3Cu-1.3C TWIP钢凝固组织中易形成显微疏松、损害合金的力学性能的问题,研究了在相同热轧温度下,改变轧制变形总量对合金微孔缺陷的消除及拉伸力学性能的影响.研究表明:通过热轧变形可以有效地减少Fe-20Mn-3Cu-1.3C TWIP钢的微孔缺陷,提高组织致密度;随着热轧变形量的增加,合金的综合力学性能显著提高,当热轧变形量达到91%时,该合金中的微孔面密度由固溶态的1.67%降低至0.71%,抗拉强度达到1223.7 MPa,延伸率达到86.8%,强塑积高达106217.2 MPa.%,比未热轧变形处理提高了78.3%,显示出优异的综合力学性能,表明消除微孔缺陷是充分发挥其高强韧性的关键.

Effect of hot rolling deformation on microstructure defects and mechanical properties of high carbon TWIP steell

To eliminate the easily formed micropore in the solidification structure,which severely deteriorates the mechanical properties of high carbon Fe-20Mn-3Cu-1.3C TWIP steel,the effect of different hot rolling reduction at the same deformation temperature on micropore elimination and tensile mechanical properties was studied.The results indicate that hot rolling deformation can remove micropore effectively and make the microstructure much denser.The comprehensive mechanical properties are greatly enhanced with the increasing of hot rolling reduction.When the hot rolling reduction comes to 91%,the area density of micropore in solution state decreases from 1.67% to 0.71%,the tensile strength and elongation rate reaches 1223.7 MPa and 86.8%,respectively,and the strength-plasticity product achieves 106217.2 MPa·% which is about 78.3% higher than that of non-hot rolled steel.This shows that micropore elimination is the key factor to improve high strength and toughness of Fe-20Mn-3.0Cu-1.3C TWIP steel.