摘 要:超(超)临界火电机组高温部件用9%-12%Cr耐热钢的高温蠕变损伤性能对其使用寿命有重要的影响.采用扫描电镜(SEM)、透射电镜(TEM)、X-Ray衍射仪和X-Ray能谱仪等对国产P91钢持久断裂试验前和持久断裂试验后(566℃、170 MPa、12493.9 h)的试样进行了低温断口、亚结构、第二相类型和成分分析,对P91钢的蠕变损伤性能进行了研究.P91钢在蠕变作用下,马氏体板条发生向亚晶结构的转变,位错密度大大降低,第二相颗粒粗化并聚集,部分合金元素由固溶态向化合态转移,同时析出新相M7C3和laves相Fe2Mo.在持久断裂试验后的试样中并未发现蠕变孔洞的存在,但组织的老化导致硬度的降低.
关键词:P91钢;蠕变损伤;板条马氏体;位错密度;第二相
分类号:TK226 文献标识码:A
文章编号:1004-9649(2007)07-0012-05
Variation in microstructure and performance during the creep of domestic P91 steel
ZHANG Hong-jun LIU Shu-tao FAN Chang-xin
基金项目:国家"十五"重大技术装备研制计划资助项目(00-318-02-01)
作者简介:张红军(1980-),男,安徽淮北人,硕士,从事超(超)临界火电机组用新材料的使用性能研究.E-mail:zhanghongjun@tpri.com.cn
作者单位:张红军(西安热工研究院有限公司,陕西,西安,710032)
刘树涛(西安热工研究院有限公司,陕西,西安,710032)
范长信(西安热工研究院有限公司,陕西,西安,710032)
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收稿日期:2007年1月18日
修稿日期:2007年4月29日
出版日期:2007年7月5日 |