超超临界锅炉用HR3C钢的σ 相析出行为研究*

doi:10.11900/0412.1961.2015.00028

金属学报

2015, Vol. 51

Issue (8): 920-924 DOI: 10.11900/0412.1961.2015.00028

本期目录 | 过刊浏览

超超临界锅炉用HR3C钢的σ 相析出行为研究^*

王慧,程从前,赵杰(

),杨鸷

STUDY ON σ PHASE PRECIPITATION OF HR3C STEEL USED IN ULTRA-SUPERCRITICAL BOILER

Hui WANG,Congqian CHENG,Jie ZHAO(

),Zhi YANG

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023

引用本文:

王慧,程从前,赵杰,杨鸷. 超超临界锅炉用HR3C钢的σ 相析出行为研究^*[J]. 金属学报, 2015, 51(8): 920-924.
Hui WANG, Congqian CHENG, Jie ZHAO, Zhi YANG. STUDY ON σ PHASE PRECIPITATION OF HR3C STEEL USED IN ULTRA-SUPERCRITICAL BOILER[J]. Acta Metall Sin, 2015, 51(8): 920-924.

全文: PDF(2667 KB) HTML

摘要:

利用OM, SEM和TEM研究了一种超超临界用HR3C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s相析出的因素. 结果表明, HR3C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-FeCr金属间化合物; 通过相计算方法对初始态HR3C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 ： HR3C钢, 时效, s相, 相计算方法, 显微组织

Abstract：

HR3C 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 HR3C steel were dependent on the stability of the microstructure, particularly the large amount of precipitates formed during service. The precipitation of s phase in HR3C steel during long-term aging for 2000 h at temperature of 700 and 750 ℃ was investigated by OM, SEM and TEM. The phase calculation method was applied to understand the factors influencing the precipitation. After 1000 h of the aging duration, irregular mass second phase was found to precipitate at the grain boundary, followed by the subsequent increasing and coarsening with time. The constituent elements of the phases were determined as Fe and Cr through SEM equipped with EDS. Further SAED analysis results led to the confirmation that these phases were basically s-FeCr compound. Combined with the prediction made through New PHACOMP method, the microstructure or phase structure in initial state may affect the subsequent precipitation behavior.

Key words： HR3C steel aging s phase phase computation microstructure

基金资助:* 国家自然科学基金项目51171037和51134013资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00028 或 https://www.ams.org.cn/CN/Y2015/V51/I8/920

图1 HR3C钢不同热处理状态微观组织OM像

图2 750 ℃时效2000 h后HR3C钢的SEM像及EDS分析

图3 750 ℃时效2000 h 后HR3C钢晶界大尺寸析出相的TEM像和SAED谱及EDS分析

图4 初始态HR3C钢的SEM像及EDS分析

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