304HC不锈钢的热塑性及变形抗力的模型

Hot Plasticity of 304HC Stainless Steel and the Establishment of the Model of Resistance to Deformation

利用热力模拟机测定了 30 4HC不锈钢的热塑性图·分析了Cu元素对热塑性的影响 ,并建立了变形抗力数学模型·采用金相、扫描电镜、能谱射线及电子探针研究了热变形后的显微组织、夹杂物和断口形貌·结果表明 :30 4HC不锈钢随Cu质量分数的升高 ,其热塑性下降·加工温度对热塑性也有重要的影响 ,合理的加工温度为 110 0～ 12 0 0℃·塑性下降的原因是在冷却过程中从奥氏体中析出Cu2 S ,Cu2 O等脆性化合物·

The plasticity map of 304HC stainless steel was determined by using Gleeble 1500 dynamic thermal mechanical simulator. The effect of Cu on the hot plasticity of the 304HC was analyzed and the mathematical model of its resistance to deformation was established. The microstructure, inclusion and fracture surface were studied by using the method of optical microscopy, SEM, EDS and EPMA. Cu has effect on the hot plasticity and the hot plasticity of the 304HC decreases with increase of Cu content. The deformation temperature also has much effect on the hot plasticity, the suitable deformation temperature are 1?100～1?200?℃. The reason is that the Cu rich compounds are precipitated from austenite during cooling. The Cu rich compounds are mainly the brittle compounds such as Cu 2S, Cu 2O.