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 Posted: Fri 16:11, 17 Dec 2010 Post subject: air jordan shoes cheap Seamless gas cylinder explo |
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Seamless gas cylinder explosion test abnormal rupture of the water
Figure 2 Bifurcation diagram break the body morphology of cylinder-kind bottle of 30CrMo with 200ram × 200ram billet metal forming. Process: Cutting a heated pulling a red one for a heal of a quenched and mechanical properties of a water pressure and water testing of a burst test. 2 test and chemical analysis results of 2.1 bottles of the chemical composition of steel results are listed in Table 1. 2.2 Determination of mechanical properties of quenched and tempered after the bottle the mechanical properties of the results listed in Table 2, Table 2 bottle the mechanical properties of the results Note: In testing on the bottle away from 380. Interception of two symmetrical pull Chung fracture test specimens 2.3.1 2.3 macro fracture observation bottles bifurcation region, the fracture was found in light gray. Have a strong metallic luster,[link widoczny dla zalogowanych], the whole covered with fine down 1:3, shiny particles. Figure 3. Figure 3 bottles with the fracture morphology 2.3.2 SEM micrograph of the bottle microscopic observation of the bifurcation region and found that the crack is the main form of quasi-cleavage fracture (Fig. 4), the microstructure is characterized by cleavage river patterns (Figure 5). Is more typical of brittle fracture. 2.4 The microstructure of metallographic examination 2.4.1 breaking bifurcation in the bottle at the end of the sample taken after metallographic metallographic microscope,[link widoczny dla zalogowanych], the coarse grains, grain size is 5.5 , tissue section morphology of mostly thick like Cambodia. Figure 6. To determine the type of organization shall bundle with the electron microscope. Microscopic morphology of the bottle and tempered martensite sorbite (Figure 7), the organization coarse carbide in lath martensite of the strip article to form between the precipitation of a large number of bits in Article wrong entanglement exists, the amount of coarse lath martensite as well. 2.4.2 breakdown of abnormal hardness testing microhardness bottles, table l bottle of the chemical composition of steel () * 28 * Physical Testing of a Physical Volume Vo1.33No. 11 (1997) Figure 4 400 × microscopic fracture morphology of cleavage in Figure 5 \hardness compared to the lower value in Table 3.3 discussed hydraulic burst test is a comprehensive performance test subjects,[link widoczny dla zalogowanych], is the value of Table 3 compare the results of microhardness testing failure types HV0.2 average conversion value (HV0 .2) (HRC) exception 26O28928427827328527828.5 normal 294306286301296319300,31.5 Note: magnification of 600 times i measured test force 1.96N. spider set time 10s, hold time 10s. Verify cylinder fragments blasting does not produce a reliable basis. burst test requirement, the value of P measured burst pressure of not less than the calculated values of the following formula. Pb ≥ equation roar - the tensile strength of material after heat treatment to ensure that the value (MPa) s - the minimum wall thickness of cylinder body measured (ram) - Cylinder body diameter (ram) to ensure that the value of such cylinder tensile strength 750MPa,[link widoczny dla zalogowanych], the measured wall thickness of bottles 6.0ram, bottle diameter 229mm. this data into the above equation, the measured P40.4MPa. bottle burst measured burst pressure of 45.8MPa. that the provisions of the cylinder body is the pressure in the hydraulic burst test under the condition of the purpose of blasting is not only assessing the actual value of bursting pressure, and the main body of the cylinder is the assessment of fracture status. should break the normal burst middle of the bottle occurred, the general was pointed at both ends of the spindle intermediate rough break, the break of the fault status of plastic fracture. The unusual break batch of bottles of brittle fracture fracture status. Typically,[link widoczny dla zalogowanych], the hydraulic burst test in the general location of the main break in the bottle at the minimum wall thickness. Water burst test, in the role of shear stress, the first bottles of the body so that the dislocation movement, and the grain boundary, phase boundary, etc., causing obstruction of dislocation movement, by the pileup dislocation elastic stress field of tensile stress to form cracks. When the crack grows to a certain size, the rapid expansion of the crack instability occurs always wax the expansion path of least resistance, so the result of unstable propagation is the formation of the main crack, along its axial symmetry around the bottle was partially opened fracture. Meanwhile, the main crack in the extended position was encountered in the process some of the bundles to the distribution of tissue section, then change the original direction of propagation along Article beam direction of cleavage, the formation of secondary cracks, the break appears forked. 4 Conclusion seamless gas cylinders in the hydraulic burst test is abnormal rupture is brittle fracture, is the lack of coarse microstructure and tempering the abnormal breakdown of the main reasons. Recommendation: on the second batch of bottles normalizing method used to obtain fine pearlite and small block iron chain body, and then use the normal quenching and tempering process fully. References (omitted) Received date: 1997 - 02I7
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