摘要
利用低倍观察、扫描电镜分析等方法,研究了超超临界汽轮机铸件材料9Cr-3W-3Co经真空感应炉冶炼后的钢锭铸态组织特征。结果表明,钢锭在冒口下方轴心处存在少量密集的缩松,无其他明显缺陷;铸态组织以板条马氏体为主,含少量的网状M_3B_2和δ铁素体;除氧化铝夹杂外,还含有复合型夹杂物,核心处以Al_2O_3、MnS为主,外层包覆着以W和Nb为主的硼碳化合物。不同位置硬度较为均匀。
By applying macro-observation,scanning electron microscope and other methods,ingot cast microstructure characteristics of ultra supercritical steam turbine casting material 9Cr-3W-3Co have been researched after vacuum induction furnace smelting.The results showed that a few of close shrinkage existed in shaft center below riser of ingot without other obvious defects,cast microstructure included lath martensite mainly,a small amount of M 3B 2 andδferrite,otherwise excepting aluminum oxide inclusions,compound inclusions also occurred,which mainly included Al 2O 3 and MnS contents on center and boron carbide compound with W and Nb on outer layer.Even hardness have been obtained at different positions.
作者
张留军
宋肖阳
李康
常军委
朱琳
Zhang Liujun;Song Xiaoyang;Li Kang;Chang Junwei;Zhu Lin
出处
《大型铸锻件》
2019年第2期51-54,共4页
Heavy Casting and Forging
关键词
汽轮机
耐热钢
夹杂
组织
硬度
steam turbine
heat-resisting steel
inclusion
microstructure
hardness
