The Study On Transient Liquid Phase Diffusion Donding Of 16Mn And 0Cr18Ni9

Low alloy steel and stainless steel are widely used in the field of petroleum and petrochemical equipment manufacturing, which can meet the requirements of reducing cost, improving equipment performance and life span. In this paper, the transient liquid phase diffusion bonding performance of 16Mn/0Cr18Ni9 is studied by using the method of double temperature and double pressure process parameters.To iron nickel amorphous alloy foil(Fe-Ni-Cr-Si-B) as the intermediate layer, and under the range of process parameters: temperature in 1150~1270℃,isothermal time 120~480s, welding pressure 3~6MPa, high temperature time in 15~35s, using the orthogonal experimental design method. Through orthogonal experiment, the influence of various factors on the strength of the joint was analyzed, and the optimal theoretical process parameters were obtained by range analysis of the tensile strength. According to the orthogonal experiment conclusion for reference, the isothermal time, isothermal temperature and welding pressure to optimize test as the main parameters, for the range of welding parameters has the feasibility.The joint microstructure,fracture characteristics, fracture morphology and element diffusion in the interface are discussed, analyzed the influence of welding parameters.The TLP welding performance of 16Mn/0Cr18Ni9 are studied by using the self-made manganese based intermediate layer(Mn-Ni-Cu-Cr-Co,Mn-Ni-Co, Mn-Ni-Cu). The diffusion effect of Mn-Ni-Cu-Cr-Co to both sides of the base material is analyzed and discussed by the multi group experiment,and the diffusion depth of each element in the middle layer is studied. As well as comparison diffusion effect of Cu and Co, looking for new elements to replace the B and Si, as a new type of intermediate layer of the alloy and melting element.In the field of petroleum and petrochemical, stainless steel intergranular corrosion failure of great harm, so the sensitivity of intergranular corrosion of0Cr18Ni9 welded joint is evaluated by EPR method. The temperature field of welding process is simulated by ANSYS, and taking this as a reference, the samples are selected and electrochemical test. Based on the evaluation mechanism of the sensitivity and the microstructure of the microstructure, the intergranular corrosion tendency of the stainless steel are analyzed.