【摘要】：針對9%Ni鋼使用溫度低,抗拉強度高和焊條工藝性不好等問題,研制了以CaO-CaF_2-TiO_2為主的渣系和Ni-Cr-Mo-Mn-W-Nb合金系的焊條。測試了熔敷金屬的力學性能,借助光學顯微鏡、掃描電鏡和光譜分析儀對接頭組織和化學成分行了分析。結(jié)果表明,研制的焊條脫渣性能良好。熔敷金屬抗拉強度為648 MPa,屈服強度為442 MPa,斷后伸長率為36%,滿足9%Ni鋼使用要求。焊縫組織為奧氏體基體+析出物,奧氏體塑性好,析出相強化基體,-196℃下平均沖擊吸收功為135 J,斷口為典型的韌性斷裂。
[Abstract]:In order to solve the problems of low temperature, high tensile strength and poor welding rod process of 9%Ni steel, the electrode of slag system and Ni-Cr-Mo-Mn-W-Nb alloy system based on CaO-CaF_2-TiO_2 was developed. The mechanical properties of the deposited metal were tested. The microstructure and chemical formation of the joints were analyzed by optical microscope, scanning electron microscope and spectrometer. The results show that the slag removal performance of the developed electrode is good. The tensile strength of the deposited metal is 648 MPa, and the yield strength is 442 MPa,. The elongation of the deposited metal is 36 and meets the requirements of 9%Ni steel. The microstructure of the weld is austenitic matrix precipitate, the austenite has good ductility, the precipitated phase strengthens the matrix, the average impact absorption energy at -196 鈩，

本文編號：2335926