Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents
发布时间：2018-10-17点击次数：
- 影响因子：11.2
- DOI码：10.1016/j.jmst.2018.10.017
- 所属单位：中国金属协会
- 教研室：0
- 发表刊物：Journal of Materials Science & Technology
- 刊物所在地：中国
- 项目来源：核材料研究与开发与服役安全保障技术，国家自然科学基金
- 关键字：25Cr-20Ni steel; weld metal; Nb; aging treatment; α-Cr phase; mechanical property.
- 摘要：The microstructure evolutions and the mechanical properties of the 25Cr-20Ni austenitic stainless steel weld metals with different Nb contents were investigated during the long term aging treatment at 700 °C. M23C6, Nb(C, N), α-Cr phase and Nb-nitride phase (Z phase) were observed in the microstructures of the aged weld metals. The results showed that the α-Cr phase precipitated in the interdendritic regions of the weld metals after being exposed to 700 °C for 500 h and the element Nb accelerated the precipitation of the α-Cr phase significantly. The density of the α-Cr phase decreased with the increase of the distance away from the primary Nb(C, N). Additionally, the α-Cr phase showed a crystallographic relationship with the austenitic matrix, α-Cr // γ and α-Cr // γ. It was observed that the Z phase precipitated in the periphery of the Nb(C, N) and may replace the Nb(C, N) after long term exposure to high temperature. The transformation of the Nb(C, N) into Z phase suggested that the Z phase had a higher stability than the Nb(C, N) particles at 700 °C for long term aging. The tensile strength of the Nb-bearing weld metal showed a continuous decrease at the initial stage of the aging treatment and then went up slightly with the prolonged aging time. However, the elongations and the impact energies of the weld metals decreased monotonously with the increase of the aging time.
- 备注：0
- 论文类型：研究论文
- 学科门类：工学
- 卷号：35
- 期号：4
- 页面范围：520-529
- ISSN号：1941-1162
- 是否译文：否
- CN号：0
- 发表时间：2019-01-01
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- 性别：男
- 职称：副教授
- 学历：研究生
- 学位：博士
- 所在单位：材料科学与工程学院
- 学科： 材料加工工程
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