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18-8 type austenitic stainless steel of the sensitivity of hydrogen embrittlement


Boiling chloride solution of hydrogen stress corrosion damage and has important links: The stress corrosion crack tip have H 'H reduction and the existence of stress corrosion fracture is complicated by the formation of a & martensite. In the dry air in the cross section of the steel of the martensite was not generated. Martensite is considered to be induced by the hydrogen J. Clearly, the study of hydrogen on the sub-stable austenitic microstructure and properties of stainless steel, austenitic stainless steel for the interpretation of stress corrosion mechanism of destruction is necessary. In this paper, the cathode electrolytic hydrogen charging and repeated bending test method. Combined with scanning electron microscopy analysis of fracture, hydrogen embrittlement susceptibility of lCr18Ni9Ti steel was discussed. 2 Test Methods 0.15ram ICrl8Ni9Ti thick steel as materials, steel after solution treatment l150 ℃. In reference to GB238-84 \Shown in Figure 1,[link widoczny dla zalogowanych], clamping one end of the sample, then the provisions of the radius of the apex around the bend test specimens bent 9O repeatedly press the opposite direction, until the sample is broken up. Circle shows the repeated bending 2. Bo, deputy issued closing date: April 22, 1993 Thick / / sample a repeated bending test Figure 1 Schematic of the physical test l994 2 bend specimen used in this experiment is the size of 100 × Canada × 0.15 ( ram) rectangular bar specimens. With concentration of 5% of the H2s04 Zhang fluid samples were above the cathode electrolytic hydrogen charging: hydrogen charging current density f = 2 × lA /, r of a hydrogen filling solution temperature 50 ℃. Hydrogen charging time depends on the needs of the people with the glycerol method sufficient diffusible hydrogen content within the sample. . 3 Analysis of test results bearing in mind that hydrogen charging time and charge 3.1 A relationship between the amount of hydrogen Figure 2 shows the experimental conditions in this paper,[link widoczny dla zalogowanych], hydrogen charging time and charge people the amount of hydrogen (diffusion of hydrogen) the relationship. Show that hydrogen charging more than 24 hours after the diffusible hydrogen content tends to saturation, and only slowly increased. 3.2 Repeated bending test results in Figure 3 for the repeated bending test results showed that the cathode electrolytic hydrogen charging conditions, the hydrogen on the ductility of austenitic stainless steel. Figure 4 shows the repeated bending fracture surface of SEM analysis. (1) For the sample without hydrogen charging. Repeated bending and not breaking 50 to 81 times when the fracture, the fracture is a typical equiaxed dimple-like, as shown in Figure 4 (a). Shows the sample without hydrogen charging are strong anti-bending; (2), hydrogen charging a 24-hour sample, repeated bending or breaking 3 times. Fracture surface as shown in Figure 4 (b): fracture surface with large but shallow dimples and quasi-cleavage features; (3) 48 hours of hydrogen charging the specimen. 2 times that repeated bending fracture, fracture surface as shown in Figure 4 (c) shows almost complete fracture of quasi cleavage fracture. Crack extension along the tear ridge. And some secondary cracks generated: 1121E7.00122 'Dan' b slander 72E. Figure 2 h hydrogen charging (H) with hydrogen charging time () relationship 50403O2O1O01224364a60721. . h Figure 3, the number of repeated bending before breaking (with the hydrogen charging time (toh) the relationship between No. 2 1994 4 correspond to different physical tests prince Yu hydrogen filling cyberspace (), the repeated bending fracture surface (SEM) (I) beam charge 氲(b) r ~ = 24h (c) t ~ h = 4Sh (d】 te ~ = 60h (4) 60 hours of hydrogen charging the specimen, bending I / 2 times the fracture,[link widoczny dla zalogowanych], fracture surface as shown in Figure 4 (d) follows: subject to cleavage fracture morphology. and a certain amount of sugar composition block cleavage,[link widoczny dla zalogowanych], indicating that hydrogen bonds to the chest even more serious. At the same time. _ brittle fracture surface was significantly higher than the central region, _ that the hydrogen in the test sample along the thickness direction of the distribution is uneven, the central region of Taiwan is a relatively small amount of hydrogen. These results show that: in a certain amount of hydrogen charging, the decreased plasticity of austenitic stainless steel, and with the amount of hydrogen charging people a corresponding increase in the brittleness increases,[link widoczny dla zalogowanych], in addition, that method by repeated bending test samples of the hydrogen embrittlement of austenitic stainless steel sheet sensitivity is feasible. conclusion. cathode electrolytic hydrogen charging of austenitic not 18-8 the plastic deformation of stainless actinium significant adverse effects. that stainless steel also has more serious hydrogen embrittlement tendency., · ● BIBLIOGRAP I share Xiao destroyed. does not turn the base of a series of learning Nang. North win: Metallurgical Engineering Health Press .1983:3102 Per, knerD. Bern ~ einIM.Handbook Min _rm 【enSteel. NewYorkPress, 1977: chap6.1322

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