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通过扫描电镜、透射电镜、能谱分析和硬度试验等方法分析了TP310HCbN耐热钢(/%:0.07C,0.39Si,1.20Mn,25.05Cr,20.40Ni,0.42Nb,0.266N)φ47mm×8 mm冷轧管经1 120~1 160℃固溶处理后在700℃0~19 570 h持久试验时的析出相。结果表明,TP310HCbN耐热钢700℃95~220 MPa持久试验时间在0~1 000 h时,随时间增加,硬度HV值由237增至255,当持久时间超过1 000 h,硬度趋于平稳;随着持久时间增加,该钢晶内析出物由颗粒状转变为棒状,并存在大量与位错相互作用的蠕虫状NbCrN析出物;生产的TP310HCbN耐热钢700℃-100 000外推持久强度为63.65 MPa满足标准要求。
The heat-resistant steel TP310HCbN (/%: 0.07C, 0.39Si, 1.20Mn, 25.05Cr, 20.40Ni, 0.42Nb, 0.266N) ø47mm × 8mm was analyzed by scanning electron microscopy, transmission electron microscopy, energy spectrum analysis and hardness test. Precipitated phase of cold rolled tube after long-term test at 700 ℃ for 0 ~ 19 570 h after solution treatment at 120-1,160 ℃. The results show that the hardness of TP310HCbN heat-resistant steel increases from 237 to 255 at 95 ℃ to 220 h at 700 ℃, and increases with the increase of time from 0 to 1000 h. With the increase of the lasting time, the precipitates in the steel crystal changed from granular to rod-shaped, and there were a lot of vermicular NbCrN precipitates interacting with the dislocations. The tensile strength of the produced TP310HCbN heat-resistant steel 700 ℃ -100 000 was 63.65 MPa Meet the standard requirements.