热处理对奥氏体不锈钢00Cr24Ni13铸坯高温热塑性的影响

采用热处理实验方法，同时结合热模拟压缩和热模拟拉伸试验，研究了热处理对奥氏体不锈钢OOCr24Ni13铸坯高温热塑性的影响．实验结果表明：热处理能够明显改变实验钢铸坯中δ铁素体的形貌；经1200℃保温3h空冷后，原始铸坯中存在的大面积连续网状δ铁素体完全转变为弥散分布的细小颗粒状组织．具有颗粒状δ铁素体的热处理试样与热处理前相比，不同温度压缩时的变形抗力略有增加，但并没有急剧恶化；热模拟抗拉强度基本保持不变；相同温度下的断面收缩率（Z）显著提高，其中Z≥60％的温度区间由1150—1280℃扩展为1050~1300℃，高塑性（Z≥80％）温度范围在150℃左右（1150~1300℃）．

Effect of heat treatment on the high temperature ductility of 00Cr24Ni13 austenitic stainless steel casting billets

The effect of heat treatment on the high temperature ductility of 00Cr24Ni13 austenitic stainless steel casting billets was investigated by heat treatment experiment, therma-compression test and thermal tensile test. The result showed that δ ferrite morphology in the casting billet could be significantly changed through the heat treatment process. After air cooling from 1200℃ for 3 h, large area of continuous reticular δ ferrite in the casting billet completely changed into dispersed granular phases. Compared with the casting billet before heat treatment, heat-treated samples which are composed of granular δ ferrite had a higher value of deformation resistance at different compression temperatures, but there was no sharp deterioration in deformation resistance, the thermal simulation tensile strength remained almost the same and the reduction of area (Z) at the same temperature increased obviously. The temperature region of Z ≥ 60% extended from 1150-1280℃ to 1050-1300%, and the high plasticity (Z ≥ 80%) range is about 150% (1150-1300℃).