文档介绍：第 51 卷 2015 年 8 月 Vol. 51 No. 8 ACTA METALLURGICA SINICA 第 8 期 Aug. 2015 超超临界锅炉用 HR 3 C 钢的σ相析出行为研究* 王慧程从前赵杰杨鸷( 大连理工大学材料科学与工程学院, 大连 116023 ) 摘要利用 OM, SEM 和 TEM 研究了一种超超临界用 HR 3 C 钢在 700 和 750 ℃长期时效至 2000 h过程中 s相的析出行为,借助相计算方法探究了影响 , HR 3 C钢在 700 和 750 ℃时效 1000 h就有不规则块状第二相在晶界析出,且随时效时间延长而增多和粗化; EDS 分析表明该相主要含 Fe 和 Cr, 结合 SAED 的分析结果最终确定其为 s-Fe - Cr 金属间化合物;通过相计算方法对初始态 HR 3 C钢进行分析认为,显微组织或相结构等差异可能是影响后续 s相析出行为的原因. 关键词 HR 3 C 钢, 时效, s 相, 相计算方法, 显微组织中图法分类号 TG 142 . 73 文献标识码 A 文章编号 0412 - 1961 ( 2015 ) 08 - 0920 - 05 STUDYON σPHASE PRECIPITATION OFHR 3C STEEL USED IN ULTRA-SUPERCRITICALBOILER WANG Hui, CHENG Congqian, ZHAO Jie, YANG Zhi School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023 Correspondent: ZHAO JIE, professor, Tel: ( 0411 ) 84709076 , E-mail: ******@dlut. Supported by National Natural Science Foundation of China (Nos. 51171037 and 51134013 ) Manuscript received 2015 - 01 - 08, in revised form 2015 - 05 - 20 A B S T R A C T HR 3C steel is a new type of austenitic heat-resistant steel which has been widely used for super- heater and re-heater tubes in the ultra-supercritical (USC) boiler. The mechanical properties of HR 3C steel were de - pendent on the stability of the microstructure, particularly the large amount of precipitates formed during service. The precipitation of sphase in HR 3C steel during long-term aging for 2000