Embrittlement of laser surface-annealed 17-4 PH stainless steel

Tsay, L.W.; Yang, Tianbao; Young, M.C.

doi:10.1016/s0921-5093(01)00941-8

Cited by 31 publications

(10 citation statements)

References 20 publications

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“…Charpy impact values of the H900 and LA specimens were 17 and 18 J, respectively. This result for T250 maraging steel contrasts sharply with a previous study, 27 which investigated the effect of LSA treatment on the impact toughness of 17‐4 PH stainless steel (AISI 630). The initial impact energy was ~9.5 J for age‐hardened (aged at 482 °C/1 h, H900) 17‐4 PH stainless steel.…”

Section: Resultscontrasting

confidence: 99%

Reduction of hydrogen embrittlement in an ultra‐high‐strength steel by laser surface annealing

Tsay

Yang

2000

Fatigue Fract Eng Mat Struct

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This paper shows that laser beam irradiation improves the resistance to hydrogen embrittlement (HE) in an ultra‐high‐strength maraging steel. Localized laser irradiation of a peak‐aged steel plate resulted in the formation of a soft surface layer called the laser‐annealed zone (LAZ). A composite region (CR) was formed when both the top and bottom surfaces of a peak‐aged specimen were laser‐annealed (LA) to leave an interior layer of untransformed base metal (BM) sandwiched between the two LAZs. Slow strain rate tensile tests showed that LA specimens had lower strength and ductility than the peak‐aged specimens when tested in air, but in a H2 S solution, the soft LAZs showed less susceptibility to HE than the BM. The fatigue crack growth rates (FCGRs) in the CR were lower than those in the BM regardless of testing environment and stress ratio (R ). The retarded crack growth in the CR was attributed to the combination of residual compressive stresses and the soft microstructures in the LAZs. The tensile fracture appearance of LA specimens tested in a H2 S solution exhibited intergranular fracture in the BM. Fractographs of the fatigue specimens tested in gaseous hydrogen revealed transgranular fracture in the LAZs and mainly quasi‐cleavage fracture in the BM.

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Section: Resultscontrasting

confidence: 99%

Reduction of hydrogen embrittlement in an ultra‐high‐strength steel by laser surface annealing

Tsay

Yang

2000

Fatigue Fract Eng Mat Struct

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“…Reverted austenite and recrystallized ferrite are formed when the materials are overaged at temperatures greater than 580°C. The plastic phases increase the toughness of 17-4 PH SS and relax its brittle quality [3].…”

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confidence: 99%

Hybrid Laser-arc Welding of 17-4 PH Martensitic Stainless Steel

Liu

Atabaki

et al. 2015

Lasers Manuf. Mater. Process.

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17-4 PH stainless steel has wide applications in severe working conditions due to its combination of good corrosion resistance and high strength. The weldability of 17-4 PH stainless steel is challenging. In this work, hybrid laser-arc welding was developed to weld 17-4 PH stainless steel. This method was chosen based on its advantages, such as deep weld penetration, less filler materials, and high welding speed. The 17-4 PH stainless steel plates with a thickness of 19 mm were successfully welded in a single pass. During the hybrid welding, the 17-4 PH stainless steel was immensely susceptible to porosity and solidification cracking. The porosity was avoided by using nitrogen as the shielding gas. The nitrogen stabilized the keyhole and inhibited the formation of bubbles during welding. Solidification cracking easily occurred along the weld centerline at the root of the hybrid laser-arc welds. The microstructural evolution and the cracking susceptibility of 17-4 PH stainless steel were investigated to remove these centerline cracks. The results showed that the solidification mode of the material changed due to high cooling rate at the root of the weld. The rapid cooling rate caused the transformation from ferrite to austenite during the solidification stage. The solidification cracking was likely formed as a result of this cracking-susceptible microstructure and a high depth/width ratio that led to a high tensile stress concentration. Furthermore, the solidification cracking was prevented by preheating the base metal. It was found that the preheating slowed the cooling rate at the root of the weld, and the ferrite-to-austenite transformation during the solidification stage was suppressed. Delta ferrite formation was observed in the weld bead as well no solidification cracking occurred by optimizing the preheating temperature.

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“…Liu [50][51][52] demonstrated that converting the phase of a material could reduce the hydrogen permeation into the bulk. The laser peening treatment could be used as a phase transformer if the ablative layer was not used.…”

Section: Recommendations For Further Studymentioning

confidence: 99%

Investigation of Laser Peening Effects on Hydrogen Charged Stainless Steels

Zaleski

2008

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Zaleski, Tania M., "Investigation of laser peening effects on hydrogen charged stainless steels" (2008). In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. This study investigated the effect of laser peening on hydrogen penetration into metal alloys. Three areas were studied: laser peening, hydrogenation, and hydrogen detection. This study demonstrated that laser peening does not reduce the hydrogen permeation into a stainless steel surface nor does it prevent hydrogen embrittlement. The effect of laser peening to reduce hydrogen-assisted fatigue was unclear. ® UMI

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Embrittlement of laser surface-annealed 17-4 PH stainless steel

Cited by 31 publications

References 20 publications

Reduction of hydrogen embrittlement in an ultra‐high‐strength steel by laser surface annealing

Reduction of hydrogen embrittlement in an ultra‐high‐strength steel by laser surface annealing

Hybrid Laser-arc Welding of 17-4 PH Martensitic Stainless Steel

Investigation of Laser Peening Effects on Hydrogen Charged Stainless Steels

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