Effects of Stabilizing Heat Treatment on Properties of Simulated Microstructures in the Heat-Affected Zone of 347H Stainless Steel

2021 ◽  
Vol 904 ◽  
pp. 88-96
Author(s):  
Liang Chang ◽  
Xue Tao Zhang ◽  
Xiao Yuan Xie ◽  
Jing Miao Li ◽  
Qiang Dai ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Heat Affected Zone ◽  
Intergranular Corrosion ◽  
Specific Situation ◽  
Corrosion Susceptibility ◽  
Epr Test ◽  
High Temperature Tensile ◽  
Micro Morphology ◽  
Crack Susceptibility

In this paper, two kinds of heat affected zone (HAZ) simulation structures of 347H stainless steel, which are coarse grain zone (CGZ) and unmixed zone (UZ), were prepared by thermal simulator. The material properties of toughness, reheat crack susceptibility and intergranular corrosion susceptibility of the two kinds of HAZ simulation structures were studied by impact test, high temperature tensile test, electrochemical potentiodynamic reactivation (EPR) test and micro morphology test. The result shows that CGHAZ had better toughness. But after the stabilizing heat treatment, it was weakened while that of the UZ was enhanced. The reheat crack susceptibility of the CGZ and UZ both increases after stabilization heat treatment, and the tendency of the UZ are more obvious. Stabilizing heat treatment has a certain effect on the prevention of sensitization process, which can improve the intergranular corrosion resistance of the material. Stabilizing heat treatment is double-edged to 347H HAZ, and it needs combined with the specific situation to used.

Effect of Sensitization Time on Intergranular Corrosion of 347H Stainless Steel

2021 ◽  
Vol 904 ◽  
pp. 506-511
Author(s):  
Liang Chang ◽  
Xue Tao Zhang ◽  
Zhi Juan Zhao ◽  
Yun Yan Peng ◽  
Jing Miao Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Intergranular Corrosion ◽  
Corrosion Test ◽  
Double Loop ◽  
Maximum Value ◽  
Microscopic Morphology ◽  
Epr Test ◽  
Sensitization Time

In this paper, 347H stainless steel of three situation of solution, primary and secondary stabilizing with 0, 12, 24, 48 and 72 h accelerated sensitization heat treatment. The change of sensitization degree with time was studied by metallographic test, double-loop electrochemical potentiodynamic reactivation (DL-EPR) test, intergranular corrosion test and microscopic morphology observation. The result shows that the sensitization degree of the solution material increases rapidly and reaches the maximum value after 12h sensitization heat treatment. After that, it still belonged to severe sensitization situation, but the index gradually decreased. After stabilizing heat treatment, the sensitization degree of the material is lower than the situation of solution. After heat treatment for 48h, the material located on “possible sensitization” range, and the sensitization degree of the secondary stabilized material was always lower than is of the primary. It indicates that the sensitization of materials can not be completely inhibited by stabilizing heat treatment, and other anti-corrosion measures should be considered.

Evaluation of the Susceptibility to Intergranular Corrosion for a Novel Cr-Mn-N Austenitic Stainless Steel Using DL-EPR

2013 ◽  
Vol 631-632 ◽  
pp. 192-197
Author(s):  
Lei Gang Zheng ◽  
Xiao Qiang Hu ◽  
Xiu Hong Kang ◽  
Dian Zhong Li
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Electrolyte Solution ◽  
Intergranular Corrosion ◽  
Xrd Analysis ◽  
Double Loop ◽  
Chromium Depletion ◽  
Electrochemical Potentiokinetic Reactivation ◽  
Epr Test ◽  
Optical Micrographs

The sensitization and intergranular corrosion (IGC) behavior of a novel Cr-Mn-N austenitic stainless steel (named as MPMD133) sensitized in the temperature range from 600 oC to 1000oC for 3 hours was investigated by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test. The effects of the sensitization temperature on the susceptibility to IGC of MPMD133 were examined in the 0.5M H2SO4 +0.01M KSCN electrolyte solution. The results show that the degree of IGC increases as the sensitization temperature increasing till 900oC. Meanwhile it decreases rapidly when the sensitization temperature is elevated up to 1000oC, which is confirmed by the subsequent optical micrographs observation. The XRD analysis reveals that the precipitation of Cr23C6 leads to chromium depletion along the grain boundaries, consequently results in the susceptibility to IGC.

scholarly journals ВПЛИВ РЕЖИМУ ТЕРМООБРОБЛЕННЯ НА ОСОБЛИВОСТІ ЛОКАЛЬНОЇ КОРОЗІЇ НЕРЖАВІЮЧОЇ СТАЛІ 08Х18Н10 У ВОДНОМУ СЕРЕДОВИЩІ

2021 ◽  
Vol 146 (3) ◽  
pp. 175-185
Author(s):  
Л. І. Ниркова ◽  
С. О. Осадчук ◽  
Ю. В. Борисенко ◽  
М. О. Рудницька-Боцман
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Aqueous Medium ◽  
Intergranular Corrosion ◽  
Treatment Temperature ◽  
Corrosion Cracking ◽  
Local Corrosion ◽  
Resistance Testing ◽  
Initial State ◽  
Local Destruction

Establishment of the effect of heat treatment on the corrosion resistance of 08H18N10 stainless steel ofausteniticclassin an aqueous medium and peculiarities of local corrosion. Standard methods were used: resistance testing against pitting andintergranular corrosion and corrosion cracking, spectral analysis method, optical metallography. The influence of two modes of heat treatment on the sensitivity of 08H18N10 stainless steel ofausteniticclassto local types of corrosion: corrosion cracking, pitting andintergranular corrosion was investigated. It was found that heat treatment in the temperature range from 860 to 970 oCin some extent increases the resistance against corrosion cracking compared to the sample in the initial state, but the formation of chromium carbides at the boundaries of austenitic grains, which causes intergranular corrosion and reduces pitting resistance are take place. Increasing the heat treatment temperature to (910-1080) oC provides satisfactory resistance to corrosion cracking, does not cause intergranular corrosion and does not impair the resistance to pitting. According to the results of a complex study, data on the influence of heat treatment regimes on the resistance of stainless steel against local corrosion such as: corrosion cracking, pitting andintergranular corrosion were obtained. The stability of the manufactures made of 08H18N10 steel in the aqueous medium as a whole will be determined by the resistance against that type of local destruction to which the steel is least resistant. Since the endurance of the product as a whole will be determined by the resistance to the such type of local destruction to which the least resistance is found, heat treatment at a temperature of (910-1080) oC is determined to be rational. According to the research results, the heat treatment regime of corrugated pipe of stainless steel 08H18N10, using of which provides satisfactory resistance against corrosion cracking in water and does not impair the resistance against intergranular and pitting corrosion is substantiated.

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