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DP980激光焊接溫度場模擬及力學性能研究
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北京航空航天大學機械工程及自動化學院,北京航空航天大學機械工程及自動化學院,北京航空航天大學機械工程及自動化學院,北京航空航天大學機械工程及自動化學院,清華大學機械工程系

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國家自然科學基金資助項目(基金號：50705050),國家國際科技合作專項資助(項目號：2013DFR50590; 2015DFA51460)


Study on temperature field simulation and mechanical properties of laser welded DP980 steel joints
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School of Mechanical Engineering and Automation,Beihang University,School of Mechanical Engineering and Automation,Beihang University,School of Mechanical Engineering and Automation,Beihang University,School of Mechanical Engineering and Automation,Beihang University,Department of Mechanical Engineering,Tsinghua University,Beijing

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    摘要:

    采用光纖激光焊接高強鋼DP980，并對溫度場分布進行有限元計算。結(jié)果表明焊縫中心熱循環(huán)溫度高達3204 ℃，迅速冷卻后形成馬氏體組織，硬度較母材提高30%，抗拉強度達到了1115.7 MPa，延伸率相對母材下降49.1%?；鼗饏^(qū)應力應變曲線存在明顯的屈服平臺，抗拉強度（850.7 MPa）明顯低于母材（986.9 MPa）。焊接接頭抗拉強度為母材的87.1%，延伸率為母材的32.7%。焊接接頭拉伸試樣和杯突試樣均斷于回火區(qū)。焊接接頭的杯突值較母材下降32.58%，母材主應變值高于焊接接頭。

    Abstract:

    High strength steel DP980 was welded using fiber laser, and the temperature field was evaluated via numerical simulation. The results reveal that the peak temperature of weld center reached 3204 ℃ and then cooled rapidly。The fusion zone contained mainly martensitic microstructure with hardness 30% higher than that of the base metal. The ultimate tensile strength of the fusion zone reached 1115.7 MPa, while the elongation was 49.1% of the base metal. The stress-strain curve of the softened zone exhibited obvious yield platform, and the ultimate tensile strength (850.7 MPa) was lower than the base metal (986.9 MPa) significantly. The ultimate tensile strength of the welded joint reached 87.1% of base metal, while the elongation reached 32.7%. All the tensile and Erichsen test samples failed at the softened zone. The major strain of the base metal was higher than the welded joint.

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賈強,郭偉,彭鵬,朱穎,鄒貴生. DP980激光焊接溫度場模擬及力學性能研究[J].稀有金屬材料與工程,2017,46(7):1905~1911.[Jia Qiang, Guo Wei, Peng Peng, Zhu Ying, Zou Guisheng. Study on temperature field simulation and mechanical properties of laser welded DP980 steel joints[J]. Rare Metal Materials and Engineering,2017,46(7):1905~1911.]
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  • 收稿日期:2016-05-07
  • 最后修改日期:2016-07-19
  • 錄用日期:2016-08-18
  • 在線發(fā)布日期: 2017-11-14
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