Fe-6Al-4Mn-0.6C高强轻质钢固溶处理工艺研究

Study on Solution Treatment Process of Fe-6Al-4Mn-0.6C High Strength Lightweight Steel

采用OM、TEM、XRD、拉伸试验、断口观察等手段与方法研究了不同温度固溶处理对热轧态Fe-6Al-4Mn-0.6C轻质钢组织与力学性能的影响。结果表明:热轧态Fe-6Al-4Mn-0.6C钢的组织为铁素体和大量细小的κ型碳化物。经920℃固溶处后热轧态Fe-6Al-4Mn-0.6C钢组织为铁素体、马氏体、残余奥氏体及少量κ型碳化物。当固溶温度达到980℃时,Fe-6Al-4Mn-0.6C钢中的κ型碳化物消失。与热轧态试验钢相比,固溶态Fe-6Al-4Mn-0.6C钢的强度有所下降。920℃固溶处理的Fe-6Al-4Mn-0.6C钢的强度最低,抗拉强度和屈服强度分别为1012.3 MPa和824.6 MPa,伸长率和强塑积最高,分别为1.5%和1518.45 MPa·%。

The effects of solution treatment at different temperatures on the microstructure and mechanical properties of hot rolled Fe-6Al-4Mn-0.6C light steel were studied by OM,TEM,XRD,tensile test and fracture observation.The results show that the microstructure of hot rolled Fe-6Al-4Mn-0.6C steel consists of ferrite and a large amount of fine typeκcarbides.The microstructure of hot rolled Fe-6Al-4Mn-0.6C steel after solution at 920℃is ferrite,martensite,residual austenite and a small amount of typeκcarbides.When the solution temperature reaches 980℃,theκcarbides in Fe-6Al-4Mn-0.6C steel disappear.Compared with that of the hot rolled test steel,the strength of Fe-6Al-4Mn-0.6C steel in solution state is decreased.Fe-6Al-4Mn-0.6C steel solution treated at 920℃has the lowest tensile strength and yield strength of 1012.3 MPa and 824.6 MPa respectively,and the elongation and strong plastic product are the highest,which are 1.5%and 1518.45 MPa·%respectively.