Dissertation > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding general issues > Mechanical properties of welded joints and Intensity

316LN austenitic stainless steel stress corrosion cracking of welded joints

Author KangHuanJu
Tutor ZhangLeFu
School Shanghai Jiaotong University
Course Nuclear energy and technology engineering
Keywords Austenitic stainless steel 316LN Cold Heat treatment TIG welding MIG welding Welded joints Stress corrosion cracking Intergranular corrosion
Type Master's thesis
Year 2012
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316LN austenitic stainless steel was selected as the third-generation reactor technology AP1000 main pipeline , timber, its mechanical properties and corrosion resistance in the country has done a lot of research, got some valuable conclusions . However, due to experimental difficulties, data processing capacity, experimental reasons for higher environmental requirements , domestic austenitic stainless steel and welded joints for stress corrosion cracking little quantitative research . The main subject for 316LN austenitic stainless steel base material and welded joints resistance to intergranular corrosion and stress corrosion cracking performance of quantitative research . The factory materials and different forms of variable annealed cold rolled , while using GTAW (TIG) and GMAW welding (MIG) welded joints produced . With the treated base material and welding material, compact tension specimens in boiling saturated magnesium chloride solution for constant load tension test . By DC voltage drop method to test the stress corrosion crack growth rate , resistance to stress corrosion cracking studies . Live again by electrochemical potentiodynamic method research resistance to intergranular corrosion. Cold rolling and cold rolling the material under heat treatment process experimental results showed that: cold rolled heat-treated material resistance to stress corrosion cracking is stronger than cold-rolled material , the same kinds of materials under rolling deformation process the greater the more resistance to stress corrosion cracking poor. Cold heat treatment material susceptibility to intergranular corrosion than cold-rolled material , the same kinds of materials under rolling process variables greater susceptibility to intergranular corrosion is higher. TIG and MIG welding of welded joints under Experimental results show that : 316LN welded joints of the overall resistance to stress corrosion cracking , MIG weld in TIG welding , 80% Ar 20% CO2 shielding gas MIG welding ( process 1107 ) better than 100% CO2 shielding gas MIG welding ( process 1108 ) . Overall susceptibility to intergranular corrosion , TIG welding is higher than MIG welding , process technology 1108 than 1107 . Under the same welding process , 316LN welded joints in different regions of resistance to stress corrosion cracking , the weld zone the worst , the best heat-affected zone , fusion zone centered ; resistance to intergranular corrosion , weld zone is best , the worst heat-affected zone , fusion zone centered. The conclusion is the main channel of the third generation of nuclear power plants manufacture, installation provides a certain reference .

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