Using the plot from the previous problem, discuss the effects of manganese on Le toughness of the steel. What is the minimum manganese required if the steel is to be sed at 0°C.
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- Q. What are the advantages of pyrolytic graphite coatings for furnaces? Q. Why is argon preferred to nitrogen as the purge gas? Q. Why are fast response electronics and background correction essential when using furnace atomization?(d) By using the data provided below, calculate the PillingBedworth ratio for the nickel (Ni) – nickel oxide (NiO) system and determine whether NiO is protective against corrosion. Atomic mass of nickel = 58.7 g.mol-1 Density of nickel = 8.91 Mg.m-3 Molecular mass of nickel oxide = 74.7 g.mol-1 Density of nickel oxide = 6.67 Mg.m-3 (e) A stainless steel pressure vessel that has fracture toughness, K1C, of 197 MN.m-3/2 is going to be exposed to a stress of 398 MN.m-2 . By using this information explain how designers can determine the thickness of the vessel so that catastrophic failure can be avoided.A device to understand how iron behaves at high temperatureswe want to design. This device (with 1% accuracy) allows the change in volume (heating) of a 1cm 3 iron cube.the resulting polymorphic transformation) must be able to feel. HMK structure in iron 911 0 C and latticeparameter 0.2863 nm. At 913 0 C, it has YMK structure and its lattice parameter is 0.3591 nm. Of measuring instrumentDetermine the accuracy tolerance it needs (i.e. at least how many cm 3 to detect a changemust). It is necessary to use at least 6 digits after the comma in this question. Hint: YMK first andFor HMK, the volume of an atom is found and then, using the number of atoms in each structure, the ironThe question can be started by finding the different volumes.
- [6] Which of the following may have caused the formation of bands of the components? (base on the picture provided) a.Overloading of the samples b.Use of wrong mobile phase c.Chamber is unsaturated d.Both a and b e.All of the aboveStudents occasionally observe the formation of a solid white side product, sometimes appearing as a white residue on the walls of the test tube, in the recovery and isolation of the copper metal in Reaction E ( CuSO4(aq) + Mg(s) --> Cu(s) + MgSO4(aq) ). Speculate on the identity of this white solid. (Use of online resources may be helpful.)AZ91 alloy; a) What is its chemical composition? b) Which of the strength increasing methods are suitable and which are not? Explain c) Is nitration suitable as one of the surface hardening methods? Please explain
- Analyze the use of austenitic or ferritic steels in irradiation damage resistance applications in detail11) JJ Techie calcined some ceramic powders at 1600℃ for 12 hrs, when removed from thefurnace, JJ was upset to find a big hard lump. Explain to JJ what happened. (10 points)12) Continue to Question 9, After grinding up to the lump, someone told JJ to add a sintering aidand deflocculant to the ceramic before trying to press it into cylinders 10 inch by 0.25 inch indiameter. Do you have any suggestions for JJ? JJ needs this size ceramic rod for experiments. Number 12 please the information in question 11 is applicable.Consider the mineral dissolution reactions below: FeSmackinawite -> Fe2+ + S2- CuScovellite -> Cu2+ + S2- ZnSsphalerite -> Zn2+ + S2- Calculate the DG°r for each reaction, and then calculate the Ksp for each sulfide phase.
- 1. What are the practical implications of alloying in carbon and alloy steels? 2. Make use of drawings of segments of the Fe-Cr phase diagram to illustrate the reason for the existence offerritic, martensitic and austenitic stainless steels by also noting the influence of specific alloying elementswhere-applicable. .packed columns the stationary phase is: (a) packed in the column (b) coated inside the column (c) a & b are correct (d) none of themExplain passivation by drawing hypothetical polarization curve and which parameters have effects on the passivity of a metal and the corrosivity of an electrolyte. Show reaction steps for a nickel oxide passive film