Microstructure, mechanical property and corrosion resistance property of Cr26Mo3.5 super ferritic stainless joints by P-TIG and laser welding

Hu, Shengsun; Pang, Jie; Shen, Junqi; Wu, Wenyong; Liu, Lala

doi:10.1007/s12209-016-2932-3

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Caetano et al [32] however suggested a remedy to intergranular corrosion susceptibility by conducting the friction stir welding at 450 rpm while maintaining little heat input. Hu et al [33] studied the corrosion resistance of weldments produced by the laser and pulse tungsten inert gas (P-TIG) welding processes in NaCl (1 M) corrosive medium. Precipitation of nitrides and carbides of titanium and niobium in both HAZ and weld metal zone was observed.…”

Section: Utilized Welding Methodsmentioning

confidence: 99%

“… Studies have attributed the reduction in corrosion resistance of FSS weldment to the increase in the heat input during welding [33,38] while according to Gupta et al [41], the opposite trend is true. There is limited knowledge concerning the optimum heat input values or range of values to produce excellent corrosion-resistant FSS welded joints for different grades of FSSs.…”

Section: Identified Gaps In Knowledge and Recommendations For Future ...mentioning

confidence: 99%

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Recent findings on corrosion of ferritic stainless steel weldments: A review

Inya,

Etim,

Uchenna

et al. 2023

Zaštita materijala

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This study covers the review of the degradation of ferritic stainless-steel weldments between 2015 and 2022. The industrial and automotive sectors make extensive use of ferritic stainless steel (FSS) due to its superior oxidation and corrosion resistance, low price, high thermal conductivity, and low thermal expansion. However, it has been reported that ferritic stainless steel is harder to weld than austenitic stainless steel and that doing so would probably result in a weaker welded joint owing to the coarsening of grains high welding temperatures. According to past research, the amount of heat applied during the welding procedure affected how soon the FSS (409 M) weldment degraded after being exposed to NaCl (3.5%) medium. The coarsening of the grains was considered to be the cause of this. When the shielding gas' CO2 content increased, the intergranular corrosion of the FSS weld metal was found to increase. Welds made with the ER430LNb filler metal had significantly lower intergranular corrosion of FSS (AISI 441) than those made with the ER430Ti filler metal. It was discovered that boiling Cu-CuSO4 - 50% H2SO4 solution increased the corrosion rate for the FSS (AISI 430) weldment more than boiling 40% HNO3 Solution. Weldments made of FSS (AISI 430) were found to be negatively affected by the CuCuSO4 - 50% H2SO4 environment in terms of intergranular corrosion attack.

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Section: Utilized Welding Methodsmentioning

confidence: 99%

Section: Identified Gaps In Knowledge and Recommendations For Future ...mentioning

confidence: 99%

Recent findings on corrosion of ferritic stainless steel weldments: A review

Inya,

Etim,

Uchenna

et al. 2023

Zaštita materijala

View full text Add to dashboard Cite

show abstract

“…To sum up, P-TIG is suitable for butt jointing of thin-walled pipelines of UNS S32205 duplex stainless steel. Because of the pulse welding gap, the peak temperature between each welding point is guaranteed to be lower, and the stay time in the high temperature range is shorter, which effectively reduces the negative impact of heat accumulation during thin-walled pipeline welding on the formation of the weld joints and avoids problems such as weld pool collapse or penetration in weld joints [ 6 , 30 , 31 , 32 ]. At present, the research on duplex stainless steel weld joints is mainly focused on thick-walled plate butt joints.…”

Section: Introductionmentioning

confidence: 99%

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Yang,

Zheng,

Wang

et al. 2023

Materials

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To solve the shortage of austenite phase precipitation caused by nitrogen loss in the welding process of UNS S2205 duplex stainless steel (DSS), shielding gas nitriding was investigated by adding different N2 contents in Ar shielding gas during the welding process. A good thin-walled pipe butt joint was formed using the pulsed tungsten inert gas (P-TIG) welding method with Ar-N2 shielding gas. High cycle fatigue tests of the weld joints were conducted to study the effect of shielding gas nitriding on the fatigue properties. Fatigue tests at three stress levels of 225 MPa, 270 MPa, and 360 MPa were carried out on the weld joints with different N2 contents, and the fatigue samples were all fractured in the high temperature heat-affected zone (H-HAZ). Within the current process parameters, the fatigue life of the 4 vol.% N2 welded joints was optimal. Fatigue striations appeared in the fatigue crack propagation zone, and the transient fracture zone was similar to the tensile fracture. Under the low-stress level, the area of the crack propagation zone under 4 vol.% N2 was the highest, the tear ridges all expanded around the crack source area, and the fatigue crack propagation zone presented a radial distribution. The proliferation and expansion of dislocations were mainly carried out in the austenite grains, and the dislocation density of the fatigue specimens under 4 vol.% N2 was smaller than that of the Ar specimens. Shielding gas nitriding effectively improved the balance of the two-phase ratio and the hardness of austenite phase, optimized the internal slip system, inhibited the proliferation of dislocations in the austenite phase, and improved the fatigue life of weld joints.

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“…304 stainless steel (SS) is extensively used as an engineering material due to its superior corrosion resistance, good appearance, and mechanical properties [1]. The passive film formed on 304 SS, with a thickness of several nanometers, plays a major role in protecting it from corrosion [2,3]. However, 304 SS cannot be used for extended periods of time in marine environments, which are rich in Cl − [4].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Stability of Passive Film on 304 SS by Chemical Modification in Alkaline Phosphate–Molybdate Solutions

Pan

Song

Jin³

et al. 2020

Trans. Tianjin Univ.

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The purpose of this work was to enhance the corrosion resistance of the passive film on 304 stainless steel (SS) by chemical modification in alkaline phosphate-molybdate solutions. The 304 SS was passivated in both phosphate and phosphate-molybdate mixed solutions to investigate the effect of molybdate on its corrosion resistance. The experimental results indicated that the passive film showed better corrosion resistance in Cl −-containing solutions after modification in phosphate-molybdate solutions than in phosphate-only solutions. Energy-dispersive spectroscopy analyses revealed that the passive film formed in phosphate-molybdate solutions contained Mo and P after modification, which is the reason for the enhanced corrosion resistance.

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Microstructure, mechanical property and corrosion resistance property of Cr26Mo3.5 super ferritic stainless joints by P-TIG and laser welding

Cited by 9 publications

References 13 publications

Recent findings on corrosion of ferritic stainless steel weldments: A review

Recent findings on corrosion of ferritic stainless steel weldments: A review

Study on Fatigue Performance of Pulsed Tungsten Inert Gas Welding Joint of Duplex Stainless Steel Thin Tube

Enhancing the Stability of Passive Film on 304 SS by Chemical Modification in Alkaline Phosphate–Molybdate Solutions

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