【摘要】 为了掌握ZG1Cr10Mo VNb N钢的强化机理及长时组织稳定性,采用Olympus-PMG3型光学显微镜、VEGA TESCAN型扫描电镜、FEI Tecnai G2 F30型透射电镜对钢的高温长时持久性能试样进行了组织分析。结果表明,(1)钢采用马氏体强化、固溶强化、沉淀析出强化、晶界或亚晶界等4种机制复合强化;(2)经过持久试验后,M23C6等第二相粒子均有所长大;(3)应力对于第二相粒子的长大有明显的促进作用;(4)钢在高温长时试验条件下,由于析出了有害的粗大Laves相,钢的长时蠕变持久强度会有所降低。更多还原

【Abstract】 In order to grasp the strengthening mechanism and long term structure stability of the ZG1Cr10 Mo VNb N steel,micro structure analysis is done for elevated temperature long term stress rupture test specimens for the steel,using Olympus-PMG3 optical microscope,VEGA TESCAN SEM,FEI Tecnai G2 F30 TEM. The results show that,( 1) comibination strengthening mechnisms including martensitic hardening, solution hardening, precipitation or dispersion hardening,boundary or sub-boundery hardening are used for the steel;( 2) after stress rupture test,all the second phases such as M23C6 is grown up;( 3) the stess promotes the growing up of the second phases;( 4) because of precipitaing large Laves phase after elevated long term test conditions,the stress rupure strength of the steel would be decreased.更多还原