FB2转子钢低周疲劳断口分析

doi:10.11930/j.issn.1004-9649.201801009

中国电力 ›› 2018, Vol. 51 ›› Issue (11): 20-25.DOI: 10.11930/j.issn.1004-9649.201801009

FB2转子钢低周疲劳断口分析

杨百勋, 丁玲玲, 田晓, 徐慧, 李益民

西安热工研究院有限公司, 陕西西安 710054

收稿日期:2018-01-05 修回日期:2018-06-22 出版日期:2018-11-05 发布日期:2018-11-16
作者简介:杨百勋(1962-),男,研究员,从事电站金属材料性能试验研究及故障诊断,E-mail:yangbaixun@tpri.com.cn;丁玲玲(1990-),女,通信作者,硕士,从事火电厂金属材料的性能分析研究,E-mail:dinglingling@tpri.com.cn
基金资助:
华能国际电力股份有限公司资助项目（620 ℃高效超超临界机组材料的运行跟踪及选材优化研究，HNKJ15-H03）。

Analysis of the Fracture Morphology of FB2 under Low-cycle Fatigue

YANG Baixun, DING Lingling, TIAN Xiao, XU Hui, LI Yimin

Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, China

Received:2018-01-05 Revised:2018-06-22 Online:2018-11-05 Published:2018-11-16
Supported by:
This work is supported by Huaneng Power International, INC (Research on Operation and Optimization of Materials Used for 620℃ Advanced Ultra-supercritical (USC) Unit, No. HNKJ15-H03).

摘要/Abstract

摘要： 采用轴向等幅低循环疲劳试验方法，对用于再热温度620 ℃的高效超超临界机组转子钢FB2的室温和高温低周疲劳性能进行了试验研究，并用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对疲劳试样的断口以及显微结构进行了分析。结果表明：低周疲劳条件下FB2表现为循环软化，高温下疲劳寿命远远低于室温下的疲劳寿命，循环应变-寿命满足Manson-Coffin关系。疲劳断口扫描分析表明：FB2的疲劳源一般起源于表面或近表面缺陷及BN夹杂，疲劳条带形貌清晰可见；断口上可见完整BN夹杂形貌。疲劳试样透射分析表明：FB2循环软化是由位错密度的降低、马氏体板条的转化、亚晶的形成和粗化造成的。

关键词: 汽轮机, FB2, 低周疲劳, 疲劳断口, 微观结构, 620 ℃, 疲劳寿命

Abstract: Low-cycle fatigue properties of FB2 steel under room temperature and 620℃ are analyzed by axialload constant-amplitude method. The fracture morphology and microstructure of the low-cycle fatigue specimen are observed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Results illustrate that the FB2 is cyclic softening material. Its cyclic life under high temperature is far shorter than that under room temperature. The relationship between the cyclic strain and its life satisfies the Manson-Coffin model. SEM analysis shows that the fatigue cracks usually initiate from the surface defects or BN inclusions. The fatigue striations as well as the intact BN inclusions can be clearly distinguished. TEM analysis shows that the cyclic softening of FB2 steel is the consequence of the reduced density of dislocation, the transform of martensite laths together with the form and coarsening of sub-grain.

Key words: steam turbine, FB2, low-cycle fatigue, fracture morphology, microstructure, 620 ℃, fatigue life

中图分类号:

杨百勋, 丁玲玲, 田晓, 徐慧, 李益民. FB2转子钢低周疲劳断口分析[J]. 中国电力, 2018, 51(11): 20-25.

YANG Baixun, DING Lingling, TIAN Xiao, XU Hui, LI Yimin. Analysis of the Fracture Morphology of FB2 under Low-cycle Fatigue[J]. Electric Power, 2018, 51(11): 20-25.

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FB2转子钢低周疲劳断口分析

Analysis of the Fracture Morphology of FB2 under Low-cycle Fatigue

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FB2转子钢低周疲劳断口分析

Analysis of the Fracture Morphology of FB2 under Low-cycle Fatigue

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