20Cr11MoVNbNB 钢高温蠕变过程中沉淀相的粗化动力学  

COARSENING KINETICS OF PRECIPITATES IN 20Cr11MoVNbNB STEEL DURING CREEP

作　　者：憨勇[1] 杨君刚[2] 符长璞[2] 

机构地区：[1]西安交通大学材料科学与工程学院 [2]西安理工大学材料科学与工程学院

出　　处：《航空学报》1998年第1期126-128,共3页Acta Aeronautica et Astronautica Sinica

摘　　要：对２０Ｃｒ１１ＭｏＶＮｂＮＢ钢５５０℃、６５０℃蠕变过程中的沉淀相研究表明：Ｍ２３Ｃ６和ＭＣ型碳化物是该钢的主要沉淀相；Ｍ２３Ｃ６和ＭＣ的粗化均符合Ｄ－ｔ１／４线性规律、受体扩散和位错扩散综合控制；Ｍ２３Ｃ６的粗化速率比ＭＣ的大。The precipitates in 20Cr11MoVNbNB heat resisting steel quenched at 1130℃ and tempered at 700℃ for 4h, and subsequently creeped at 550℃ for 5462h and 650℃ for 2968h were studied by means of XRD, TEM, etc. It is shown that M 23 C 6 and MC are main precipitates in 20Cr11MoVNbNB steel. The coarsening kinetics of M 23 C 6 and MC have the same 4th power law, synthetically controlled by both block diffusion and dislocation diffusion, and regardless of their original precipitating positions. The coarsening rate of M 23 C 6 is faster than that of MC.

关 键 词：耐热钢 蠕变 沉淀相 粗化动力学 

分 类 号：TG142.73[一般工业技术—材料科学与工程]