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低活化铁素体-马氏体钢搅拌摩擦焊接头组织和性能分析

张超, 崔雷, 刘永长, 王东坡, 周猛兵

张超, 崔雷, 刘永长, 王东坡, 周猛兵. 低活化铁素体-马氏体钢搅拌摩擦焊接头组织和性能分析[J]. 焊接学报, 2019, 40(6): 52-57. DOI: 10.12073/j.hjxb.2019400154
引用本文: 张超, 崔雷, 刘永长, 王东坡, 周猛兵. 低活化铁素体-马氏体钢搅拌摩擦焊接头组织和性能分析[J]. 焊接学报, 2019, 40(6): 52-57. DOI: 10.12073/j.hjxb.2019400154
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ZHANG Chao, CUI Lei, LIU Yongchang, WANG Dongpo, ZHOU Mengbing. Microstructure and mechanical properties of friction stir welded joints of reduced activation ferritic-martensitic steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(6): 52-57. DOI: 10.12073/j.hjxb.2019400154
Citation: ZHANG Chao, CUI Lei, LIU Yongchang, WANG Dongpo, ZHOU Mengbing. Microstructure and mechanical properties of friction stir welded joints of reduced activation ferritic-martensitic steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(6): 52-57. DOI: 10.12073/j.hjxb.2019400154
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低活化铁素体-马氏体钢搅拌摩擦焊接头组织和性能分析

  • 1.

    天津大学 天津市现代连接技术重点实验室, 天津 300350;中国核动力研究设计院, 成都 610200

  • 2.

    天津大学 天津市现代连接技术重点实验室, 天津 300350

  • 3.

    中国核动力研究设计院, 成都 610200

基金项目: 国家自然科学基金资助项目（U1660201，517011741）

Microstructure and mechanical properties of friction stir welded joints of reduced activation ferritic-martensitic steel

  • 1.

    Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300354, China;Nuclear Power Institute of China, Chengdu 610200, China

  • 2.

    Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300354, China

  • 3.

    Nuclear Power Institute of China, Chengdu 610200, China

摘要

    摘要
  • 摘要: 文中对9% Cr低活化铁素体-马氏体钢搅拌摩擦焊接头的组织和性能进行了分析.结果表明，搅拌摩擦焊接头不同区域微观组织存在明显的差异.搅拌区内奥氏体的动态再结晶引起晶粒细化和马氏体转变，并且晶界M23C6相溶解，晶内M3C相析出；热力影响区组织变化与搅拌区相似，但晶粒尺寸明显大于母材；热影响区和母材区均表现回火组织特征.搅拌区硬度显著提高，分布均匀；热力影响区硬度值变化较大；热影响区发生软化，其硬度值在接头区域最低.随着拉伸测试温度的增加，搅拌区的屈服强度单调降低，抗拉强度先增大后减小，而断后伸长率先减小后增大.
    Abstract: Microstructure and mechanical properties of friction stir welded joints of 9%Cr reduced activation ferritic-martensitic (RAFM) steel were studied in the present paper. The results indicate that there exists significant microstructural difference at different zones in friction stir welded joints. In stir zone (SZ), dynamic recrystallization of austenite leads to grain refinement, martensitic transformation, dissolution of M23C6 phase and precipitation of M3C phase. Although microstructure in thermal mechanically affect zone (TMAZ) is similar to SZ, the grain size in TMAZ obviously larger than that in base materials (BM). Both heat affect zone (HAZ) and BM perform tempered microstructural characteristic. The hardness of SZ in joint increases significantly and the distribution is uniform. There is a great variation for hardness in TMAZ. The HAZ is softened and its hardness value is the lowest in the joint. With the increase of the testing temperature, the yield strength decreases monotonically and the ultimate tensile strength first increases and then decreases, while the total elongation decreases first and then increases.
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    • 参考文献(11)
  • [1] Zhou X, Liu C, Yu L, et al. Phase transformation behavior and microstructural control of high-Cr martensitic/ferritic heat-resistant steels for power and nuclear plants:a review[J]. Journal of Materials Science&Technology, 2015, 31:235-242.
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    [7] 秦国梁,张坤,张文斌,等. 6013-T4铝合金薄板搅拌摩擦焊热输入对焊缝成形及组织性能的影响[J].焊接学报, 2010, 31(11):5-8 Qin Guoliang, Zhang Kun, Zhang Wenbin, et al. Effect of heat input on weld formation and microstructure and properties of friction stir welding of 6013-T4 aluminum alloy sheets[J]. Transactions of the China Welding Institution, 2010, 31(11):5-8
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  • 收稿日期:  2018-08-28

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