杨啸峰,徐雅欣,鲁金涛,黄锦阳,李文亚

• 1:西北工业大学材料学院
• 2:西安热工院研究有限公司

摘要(Abstract)：

奥氏体钢在锅炉关键部位服役过程中面临烟气/煤灰腐蚀+应力协同作用的挑战，存在一定的安全隐患。在静态空气及烟气/煤灰腐蚀环境下，通过模拟实验台对Super 304H钢进行温度为650℃、应力为200～300 MPa的持久实验，研究腐蚀环境对其持久性能及组织演变的影响。结果表明：相较于空气环境，腐蚀条件下Super 304H钢持久寿命下降幅度可达83%，且随着持久应力的降低合金寿命下降更明显；烟气/煤灰腐蚀导致合金表面连续的腐蚀产物出现开裂、剥落，基体发生内硫化，在拉应力的共同作用下试样内部出现沿晶开裂等蠕变损伤；基体表面由于合金元素的损失，在高温下发生再结晶，并在实验结束后发生马氏体转变，腐蚀-应力环境中合金表面腐蚀产物的开裂、剥落，内硫化物的形成，表层再结晶细晶区的增厚和晶界损伤的加剧共同促进了Super 304H钢的持久断裂。烟气/煤灰腐蚀环境通过影响Super 304H钢腐蚀过程，恶化合金基体组织影响其持久性能。

关键词(KeyWords)： Super 304H钢;模拟烟气/煤灰腐蚀;持久性能;组织演变

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目（52071265,52271070）;; 中国华能集团有限公司总部科技项目（HNKJ20-H41,TA-20-TYK03）;; 西北工业大学分析测试中心基础研究开放测试基金（2021T013）~~

作者(Author): 杨啸峰,徐雅欣,鲁金涛,黄锦阳,李文亚

DOI: 10.19666/j.rlfd.202306361

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