不同锻造比对P91管坯组织及性能的影响规律研究

Study on the Influence of Different Forging Ratio to Microstructures and Properties of P91 Pipe Billets

采用不同的锻造比工艺制备P91管坯,对管坯的显微组织、低倍及力学性能进行了分析研究。结果表明:当锻造比为2时,制备的P91管坯组织晶粒粗大,管坯横向截面组织分布不均匀,无法实现探伤;当锻造比提高到3时,可制备晶粒细小且组织分布均匀的P91管坯;锻造比为3时,制备的管坯低倍组织明显优于锻造比为2制备的管坯低倍组织,有利于后续的制管工艺;当锻造比为3时,可制备满足标准ASME SA335、GB5310—2008要求用的P91管坯。

In this paper, the P91 pipe billets are prepared by different forging raio, the microstructure, mechanical properties and low magnification are analyzed and studied. The results shows that when the forging ratio is 2, the microstructure grains of prepared P91 pipe billet are larger, the transverse sectional microstructures distribution of pipe billet are not uniform, NDT could not be achieved. When the forging ratio is increased to 3, the fine grains could be prepared and the microstructure distribution of pipe billet is uniform; the low magnification microstructure with forging ratio 3 is obviously better than that of billets with forging ratio 2, which is conducive to the subsequent preparing pipe process; when the forging ratiowass 3, prepared P91 pipe billets could meet the standard requirements of ASME SA335 and GB 5310-2008.