冷变形对Sanicro 25奥氏体耐热钢组织和性能的影响

Effect of Cold Deformation on Microstructure and Properties of Sanicro 25 Austenitic Heat-Resistant Steel

对Sanicro 25奥氏体耐热钢进行变形量分别为0,20%,50%的冷轧变形,通过组织观察、电子背散射衍射、X射线衍射、拉伸试验和硬度测试等方法研究了冷变形对该钢显微组织、织构和力学性能的影响。结果表明:在试验条件下冷变形时试验钢中未形成新相;随冷变形量的增加,试验钢中孪晶数量和位错密度增加;试验钢在反极图z方向上的晶粒取向〈111〉,〈001〉为不稳定取向,冷变形导致了新的{112}〈110〉织构产生;随着冷变形量的增大,试验钢的Rotated cube{001}〈110〉和Goss{110}〈001〉织构的强度总体呈减弱趋势,抗拉强度、屈服强度和硬度增大,抵抗塑性变形能力减弱。

Cold rolling deformation with deformation amounts of 0,20%,50% was conducted on Sanicro 25 austenitic heat-resistant steel.The effects of the cold deformation on the microstructure,texture and mechanical properties of the steel were investigated by microstructure observation,electron backscatter diffraction,X-ray diffraction,tensile tests and hardness tests.The results show that no new phases were formed in the test steel during cold deformation under the test conditions.With the increase of cold deformation,the numbers of twins and dislocation density in the test steel were improved.The grain orientation 〈111〉,〈001〉of the test steel in the inverse pole figure z direction was unstable orientation.A new {112}〈110〉texture was produced by cold deformation.With the increase of cold deformation,the strength of Rotated cube {001}〈110〉and Goss {110}〈001〉textures of the test steel generally showed a weakening trend,the tensile strength,yield strength and hardness increased,and the ability to resist plastic deformation was weakened.