【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]:The high strength steel DP980, was welded by optical fiber laser and the temperature distribution was calculated by finite element method. The results show that the thermal cycle temperature in the center of the weld is as high as 3204 鈩，

本文編號：2475201