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对P92钢的热拉伸行为、热压缩变形行为、低倍、显微组织以及常温力学性能进行了分析研究。结果表明:当变形温度为950~1150℃时,P92可获得良好的热塑性,有力于材料的热塑性变形;在同一应变速率条件下,变形抗力对变形温度较敏感,采用较高的变形温度,可降低锻造过程中的变形抗力;当变形温度达到1050℃以上,随变形程度增加,会发生奥氏体组织的动态再结晶,从而进一步细化晶粒。变形抗力随变形温度的升高显著降低,因此在不发生过热的情况下,应采用尽可能高的变形温度,以降低锻造过程中的变形抗力。综合考虑各种因素,选定的较佳锻造温度为950~1150℃;采用真空熔炼+锻造工艺开可生产组织致密、晶粒细小、探伤缺陷当量小的P92管坯,经检验,各项常规性能满足国标和美标要求。
The hot tensile behavior, hot compression deformation behavior, low magnification, microstructure and mechanical properties at room temperature of P92 steel were analyzed. The results show that when the deformation temperature is 950 ~ 1150 ℃, P92 can obtain good thermoplasticity, which is strong in the thermoplastic deformation of the material. Under the same strain rate, the deformation resistance is more sensitive to the deformation temperature, and the higher deformation temperature can be used. Reduce the deformation resistance during the forging process; when the deformation temperature reaches above 1050 ℃, the dynamic recrystallization of the austenite structure will occur with the increase of deformation, so as to further refine the grains. Deformation resistance with deformation temperature increased significantly lower, so in the event of overheating, the deformation temperature should be as high as possible to reduce the deformation resistance during forging. Comprehensive consideration of various factors, the selected forging temperature of 950 ~ 1150 ℃; the use of vacuum melting + forging process to produce dense, fine grain, flaw detection equivalent P92 small tube, after inspection, the conventional Performance to meet the national standard and American standard requirements.