一种新型镍基耐蚀合金与625合金异种金属焊接接头的组织和力学性能
发布时间：2018-07-20 11:36
【摘要】：对一种新型镍基耐蚀合金X-2#与625合金手工氩弧焊接接头进行拉伸性能和硬度的测试,并结合OM,SEM和EDS分析等手段研究了焊接接头的组织和性能.结果表明,X-2#/625异种金属焊接焊缝重熔区等轴晶组织增多,有利于提高焊缝区强度.X-2#合金一侧熔合区组织过渡良好,而625合金一侧晶界有Nb C和Laves相析出,影响材料的力学性能.热影响区在靠近重熔区附近的晶粒由于受2次热循环的影响,出现晶粒长大现象,而X-2#合金一侧热影响区的热稳定性较好.625合金母材晶粒细小导致其热影响区晶粒长大明显,从而使625合金一侧热影响区的Vickers硬度值降低.X-2#/625焊接接头在室温到700℃下的抗拉强度均低于2侧母材,焊缝区为接头最薄弱环节,断口形貌均为韧窝状的韧性断口.
[Abstract]:The tensile properties and hardness of a new type of nickel base corrosion resistant alloy X-2# and 625 alloy were tested. The microstructure and properties of the welded joints were studied by means of OMU SEM and EDS analysis. The results show that the increase of equiaxed grain structure in weld remelting zone of #625 dissimilar metal welding is beneficial to increase the strength of weld zone. The microstructure transition of the fusion zone on the side of X-2# alloy is good, while NB C and Laves phase are precipitated at the grain boundary of 625 alloy, which affects the mechanical properties of the material. The grain growth in the heat-affected zone near the remelting zone is due to the effect of two thermal cycles, while the thermal stability of the heat-affected zone on the side of X-2# alloy is better than that in the heat-affected zone. The smaller grain size of the base metal in the X-2# alloy leads to the obvious grain growth in the heat-affected zone. Thus, the Vickers hardness of 625 alloy on one side of heat-affected zone was reduced. The tensile strength of the welded joints at room temperature to 700 鈩，
本文编号：2133386
[Abstract]:The tensile properties and hardness of a new type of nickel base corrosion resistant alloy X-2# and 625 alloy were tested. The microstructure and properties of the welded joints were studied by means of OMU SEM and EDS analysis. The results show that the increase of equiaxed grain structure in weld remelting zone of #625 dissimilar metal welding is beneficial to increase the strength of weld zone. The microstructure transition of the fusion zone on the side of X-2# alloy is good, while NB C and Laves phase are precipitated at the grain boundary of 625 alloy, which affects the mechanical properties of the material. The grain growth in the heat-affected zone near the remelting zone is due to the effect of two thermal cycles, while the thermal stability of the heat-affected zone on the side of X-2# alloy is better than that in the heat-affected zone. The smaller grain size of the base metal in the X-2# alloy leads to the obvious grain growth in the heat-affected zone. Thus, the Vickers hardness of 625 alloy on one side of heat-affected zone was reduced. The tensile strength of the welded joints at room temperature to 700 鈩，
本文编号：2133386
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