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Define an Fe-C martensite. (b) Describe the following types of Fe-C martensites that occure in plain-carbon steels: (i) lath martensite, (ii) plate martensite. (c) Describe some of the characteristics of the Fe-C martensite transformation that occurs in plain carbon steels. (d) What causes the tetragonality to develop in the BCC iron lattic when the carbon content of Fe-C martenistes exceeds about 0.2 percent? (e What causes the high hardness and strength to be developed in Fe-C martensites of plain carbon steels when their carbon conent is high?
A fellow I know wanted to know the coefficient of friction between steel and commercial carpet. The value was not in the tables of any textbook he had, so he devised an experiment.
A visco-elastic system is subjected to an instantaneous deformation of 100 %. The stress, necessary for this deformation, is 2 MPa. After the deformation the stress decreases as a function of time as displayed in the table below.
Ozone is a conservative indoor air pollutant produced by photocopy machines at a rate of 10 mg/h per machine. The owners of CopyCat reproduction services want to open a new
For some minerals color is a diagnostic property making identification rather easy. However, certain minerals can also occur in a wide variety of colors making color a poor tool for identification. List different colors for the mineral quartz lo..
A rectangular unfinished concrete channel with wood forms is laid on a bottom slope of 0.0064 to carry a flow of 20m^3/s of water. Determine the width of the channel when the flow is in critical condition.
A cylindrical sample of soil 39 mm in diameter and 77 mm long weighed 180 g. The sample is not fully saturated and its moisture content was found to be 27.0%. Assume rS = 2.70 Mg/m3. Determine: a. the bulk density, r b. the dry density, rd c. the d..
A w14X74 of A992 Steel has a length of 20 feet and fixed ends. Compute the design compressive strength for LRFD and the allowable compressive strength for ASD.
Compute the design strengths of a rectangular beam with bw=15 in, d = 36 in, d'=2.5 in, fy= 60ksi, fc'=4ksi, and at the top of the beam are 4 #8 bars, the bottom has two rows of 4 #10 beams
A 4m deep clay layer is underlain by impermeable shale. A sample of clay from the layer is subjected to an appropriate increment of stress in a consolidation test giving the following results
Two wells had been drilled on 40-acre spacing. Well 1 is injectionand Well 2 is producing well. Down hole injection pressure is 8500psi, and bottom hole pressure in producing well is 2400 psi.
Describe the reasons for enhancing drainage and situation where it is required. Explain some of the detrimental effects of drainage. Describe the types of drainage system indicating suitability criteria. 200- 250 word limit
Martin pays rent of $500 per month for the 9-month acedemic year, he is going to travel the world this summer and won't be working. how much must he set aside in his savings account for the 3-month summer to cover his rent for the next year
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