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| 时效处理对2205双相不锈钢焊接接头组织的影响 |
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邹德宁1, 韩英1,2, 范光伟3,2, 张威3
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1.西安建筑科技大学冶金工程学院, 西安 710055;2.西安交通大学金属材料强度国家重点实验室, 西安 710049;3.太原钢铁集团(有限)公司先进不锈钢材料国家重点实验室, 太原 030003
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| 摘要: |
| 对固溶处理后的焊条电弧焊焊接2205双相不锈钢接头进行850℃保温30,180,360 min时效处理.采用光学显微镜、X射线衍射仪、能谱仪和铁素体仪分析了不同区域组织演变和σ相析出的规律.结果表明,焊接接头进行时效处理后,各区域均有σ相析出,析出位置主要在α/γ晶界或α/α晶界,并且σ相向铁素体内部长大,其析出机理是α→σ+γ2.延长时效时间,铁素体含量降低,σ相含量升高;σ相由点状→连续网状→片状分布转变;与母材和HAZ相比,焊缝区对时效处理最为敏感,σ相析出速率最大,当时效360 min后,铁素体几乎完全转变成奥氏体和σ相. |
| 关键词: 双相不锈钢 焊接接头 固溶处理 时效处理 显微组织 |
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| 基金项目:陕西省教育厅专项基金资助项目(07JK309);陕西省科学技术研究发展计划项目(2010K10-13) |
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| Effect of aging treatment on microstructure of 2205 duplex stainless steel welds |
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ZOU Dening1, HAN Ying1,2, FAN Guangwei3,2, ZHANG Wei3
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1.School of Metallurgy and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;2.State Key Laboratory for Mechanical Behavior of Metal Materials, Xi'an Jiao Tong University, Xi'an 710049, China;3.State Key Laboratory of Advanced Stainless Steel Materials, Taigang Stainless Steel Co., Ltd., Taiyuan 030003, China
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| Abstract: |
| The solution-treated welded joints of 2205 duplex stainless steel welded by shielded metal arc welding were treated by aging treatment at 850℃ for 30,180 and 360 min,respectively.The microstructure evolution and the precipitation of σ phase were analyzed by OM,XRD,EDS and ferrite scope detector.The results indicate that in each region of the aged joints,σ phase precipitates at γ/α or α/α grain boundaries and grows into ferrite phase.The formation mechanism is a eutectoid reaction of α→σ+γ2.The increase of aging time leads to a decrease in ferrite phase and an increase in σ phase.σ phase morphology changes from spotted→reticular→schistic state.Compared to the base metal and HAZ,the weld metal with the most precipitation rate of σ phase is more sensitive to the aging treatment,in which the ferrite almost completely transforms into austenite and σ phase after aging for 360 min. |
| Key words: duplex stainless steel welded joint solution treatment aging microstructure |
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