【作者】 陈力；

【导师】 闫久春；

【作者基本信息】 哈尔滨工业大学 ， 材料加工工程， 2009， 硕士

【摘要】 本文采用焊条电弧焊方法,分别采用THA302奥氏体焊条和NiCrFe-1镍基合金焊条作为填充材料,焊接16Mn钢和316L不锈钢。通过对焊缝的微观组织分析及力学性能测试,重点研究母材与填充材料的焊接冶金特性。研究结果表明,分别采用两种焊条不同电流下焊接时,焊缝微观组织均由由柱状树枝晶组成。只有当采用THA302焊条电流为180A时,在焊缝中央产生结晶裂纹。采用THA302奥氏体焊条焊接时,16Mn低合金钢一侧熔合区为一层厚度为10～20μm,呈“针状”的类马氏体组织。而采用NiCrFe-1镍基合金焊条焊接时,16Mn低合金钢一侧熔合区比采用THA302焊条焊接时窄,且没有发现“针状”的类马氏体组织。16Mn钢热影响区主要是由铁素体和珠光体组成,且大部分铁素体以魏氏组织的形态存在,并随着电流的增大,16Mn低合金钢热影响区中的魏氏组织增加。采用THA302奥氏体焊条和NiCrFe-1镍基合金焊条焊接316L不锈钢和16Mn低合金钢,接头的最高强度均达到520MPa,并且都随着焊接电流的增大,抗拉强度降低。更多还原

【Abstract】 16Mn steel and 316L stainless steel are welded with two different electrodes, THA302 and NiCrFe-1. By microstructure observing and mechanical tests, the emphasis is put on welding metallurgy of base materials and filling materials Results show that the microstructure of the weld is coarse columnar dendritic grains and lots of disperse second-phase particles in the grain boundary. There is no crack found in the weld except when using THA302 as a filler metal at 180A. The microstructure of heat affected zone of 16Mn steel is proeutectoid ferrite and perlitic structure. And the microstructure of heat affected zone of 316L stainless steel is coarse equaxed austenite. When using THA302 austenite electrode as filler metal, the fusion zone is a needle-like thin film (10～20μm) martensite structure adjacent to the heat affected zone of 16Mn low alloy steel. While using NiCrFe-1 electrode as a filler metal, the needle-like thin film was not found.The tensile strength of joints with THA302 and NiCrFe-1 electrodes can reach 520MPa, and all decrease with the increasing of welding current.更多还原