高温和应力作用下国产S30432钢中Z相的析出行为  

Precipitation Behaviour of Z-phase in Domestic S30432 Steel at High-Temperature and Stress

作　　者：唐波[1] 朱丽慧[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《机械工程材料》2015年第5期19-22,共4页Materials For Mechanical Engineering

基　　金："十二五"国家科技支撑计划资助项目(2011BAK06B04);国家自然科学基金资助项目(51171097)

摘　　要：利用RD-2型高温持久试验机、高分辨透射电子显微镜和能谱仪研究了国产S30432耐热钢在供货态及不同温度、应力条件下持久断裂后的第二相,尤其是Z相的析出行为及影响因素。结果表明:供货态S30432钢中只存在MX相;在650℃、170 MPa、10 712h持久条件下析出了M23C6碳化物和富铜相;在700℃、150 MPa、937h条件下,不仅析出了M23C6碳化物和富铜相,还出现了Z相及包含MX相和Z相的颗粒;在700℃、150 MPa、1 944h条件下Z相粗化缓慢,在700℃、100 MPa、11 832h条件下Z相粗化明显;高温和应力均会加速Z相的析出。Precipitation behaviour and effect factors of Z-phase in domestic S30432 steel in supply state and after creeping at different temperatures and stresses were investigated by RD-2 type creep testing, transmission electron microscopy and energy disperse spectroscopy. Results show that only MX phase was observed in S30432 steel in supply state. Cu-rich phase and Mz3 C6 carbide precipitated under the conditions of 650 ℃, 170 MPa and 10 712 h. Besides, Z-phase and hybrid MX/Z-phase particles were found under the conditions of 700 ℃, 150 MPa and 937 h. Z-phase, whose size increased slowly under the conditions of 700 ℃, 150 MPa and 1 944 h, coarsened obviously under the conditions of 700 ℃, 100 MPa and 11 832 h. The precipitation of Z-phase could be accelerated by high-temperature and stress.

关 键 词：耐热钢 Z相 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]