【摘要】：采用真空冶煉技術(shù)研制開發(fā)了Q960高強鋼氣體保護焊絲,利用金相顯微鏡(OM)、掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)、X射線衍射(XRD)并通過常溫拉伸和低溫沖擊等試驗研究了焊絲及熔敷金屬化學成分、組織及力學性能之間的關(guān)系。結(jié)果表明,采用Mn-Ni-Cr-Mo-Ti合金體系,研制的最佳強韌性焊絲焊態(tài)熔敷金屬抗拉強度為920 MPa,-60℃沖擊吸收能量為66.7 J;合金元素含量提高,組織由貝氏體相向貝氏體+馬氏體混合相轉(zhuǎn)變,但合金元素含量過高,會導(dǎo)致馬氏體相增多,對韌性不利;熔敷金屬中存在一定量的殘余奧氏體,可提高韌性。
[Abstract]:Gas shielded wire for Q960 high strength steel was developed by vacuum smelting technology. (OM), scanning electron microscope (OM), transmission electron microscope (SEM),) and transmission electron microscope (TEM),) were used to develop Q960 high strength steel wire. The relationship between chemical composition, microstructure and mechanical properties of wire and deposited metal was studied by X-ray diffraction (XRD) and tensile test at room temperature and impact at low temperature. The results show that the best tensile strength of weld metal deposited by Mn-Ni-Cr-Mo-Ti alloy system is 920 MPa,-60 鈩，

本文編號：2385171