锻压技术

620 ℃高效火电机组用FB2转子钢的材质特性与质量状态

英文标题：Material characteristics and quality state of FB2 rotor steel used in 620 ℃ high-efficiency thermal power unit

作者：田晓秦承鹏徐慧李太江杨百勋

关键词：620 ℃高效火电机组汽轮机 FB2转子锻件制造质量强化机理力学性能微观组织

分类号：TK265

出版年,卷(期):页码：2022,47(7):42-52

摘要：

系统地阐述了FB2转子锻件的制造工艺、关键工序、合金化原理及强化机理、主要性能特点，同时对不同厂家FB2转子锻件的制造质量进行了对比分析，获得了不同厂家FB2转子锻件的性能差异，并分析了其产生的主要原因。结果表明，JSW、JCFC和Fomas生产的FB2转子锻件的主要合金元素含量、室温拉伸强度处于同一水平，微观组织均为100%回火马氏体，组织性能均匀。进口FB2转子锻件的质量差异主要表现为非金属夹杂物含量、室温伸长率、冲击韧性的不同，这主要是由FB2转子锻件中B含量的差异引起的。建议加强对FB2转子锻件中B含量的严格控制，防止大量块状BN夹杂物的析出，以保证FB2转子锻件的综合力学性能。本研究结果可为FB2转子锻件的采购、订货、质量验收提供技术依据，并为FB2转子锻件的国产化研制提供参考。

The manufacturing process, key procedures, alloying principles, strengthening mechanism and main performance characteristics of FB2 rotor forgings were systematically introduced, and at the same time, the manufacturing quality of FB2 rotor forgings from different manufacturers was compared and analyzed. Then, the performance differences of FB2 rotor forgings from different manufacturers were obtained, and the main reasons for its occurrence were analyzed. The results show that the main alloy element contents and room temperature tensile strength of FB2 rotor forgings produced by JSW, JCFC and Fomas are at the same level, and the microstructures are all 100% tempered martensite with uniform microstructure and properties. The quality difference of imported FB2 rotor forgings is mainly manifested in the difference of non-metallic inclusions, room temperature elongation and impact toughness, which is mainly caused by the difference in B content of FB2 rotor forgings. Thus, it is recommended that B content of FB2 rotor forgings is strictly controlled to prevent the precipitation of a mass of block BN inclusions, so as to ensure the comprehensive mechanical properties of FB2 rotor forgings. The results of this research can provide a technical basis for the purchase, ordering and quality acceptance of FB2 rotor forgings, and provide a reference for the domestic manufacture of FB2 rotor forgings.

基金项目：

中国华能集团公司总部科技项目（HNKJ15-H03）

作者简介：田晓（1985-），女，硕士，高工 E-mail：tianxiao@tpri.com.cn

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