Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at...

Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at a position 1.8 mm into an iron-carbon alloy that initially contains 0.031 wt% C. The surface concentration is to be maintained at 1.2 wt% C, and the treatment is to be conducted at 1090°C. Assume that D0 = 5.1 x 10-5 m2/s and Qd =154 kJ/mol. You will find the table below useful.

Expert Solution

samet mamat answered 2 years ago

Determine the carburizing time necessary to achieve a carbon concentration of 0.50 wt% at a position...

Determine the carburizing time necessary to achieve a carbon concentration of 0.50 wt% at a position 3.3 mm into an iron-carbon alloy that initially contains 0.18 wt% C. The surface concentration is to be maintained at 1.1 wt% C, and the treatment is to be conducted at 1050°C. Assume that D0 = 3.1 × 10-5 m2/s and Qd = 120 kJ/mol. The following table may be useful. An iron-carbon alloy initially containing 0.227 wt% C is exposed to an oxygen-rich...

In the carburizing of 1018 steel... The carbon concentration will be equal to or greater than...

In the carburizing of 1018 steel... The carbon concentration will be equal to or greater than 18% by wt 2mm below the surface after 24 hours at 500C. The carbon concentration will be equal to or less than 0.18% by wt 2mm below the surface after 24 hours at 500C. The carbon concentration will be equal to or less than 18% by wt 2mm below the surface after 24 hours at 500C. The carbon concentration will be equal to or...

At what distance ‘X’ will the carbon concentration in a steel specimen be 0.70 wt. %...

At what distance ‘X’ will the carbon concentration in a steel specimen be 0.70 wt. % after 10h at 1100 0C, if the starting composition was 0.35 wt. % C and the surface concentration is 1.35 wt.% C? how do you get x/2sqrt(DT)=0.66085?

Consider the concentration gradients of oxygen and carbon dioxide to determine their direction of movement at...

Consider the concentration gradients of oxygen and carbon dioxide to determine their direction of movement at the alveoli of the lungs. Select the true statement. Oxygen moves down its concentration gradient from the lungs to the blood. Carbon dioxide moves down its concentration gradient from the lungs to the blood. Oxygen moves down its concentration gradient from the lungs to the blood. Carbon dioxide moves down its concentration gradient from the blood to the lungs. Oxygen moves down its concentration...

Calculate the time necessary to achieve an investment goal. Give your answer to the nearest day....

Calculate the time necessary to achieve an investment goal. Give your answer to the nearest day. Use a 365-day year. (First enter the total number of full years, then give the remaining days.) $9,000 at 5% daily interest; deposit $4,000

Many studies have been conducted to determine the concentration of CO (carbon monoxide) near freeways with...

Many studies have been conducted to determine the concentration of CO (carbon monoxide) near freeways with various conditions of traffic flow. The basic technique involves measuring CO concentrattions with a spectrophotometer. These machines are quite delicate and have to be calibrated every day. If the machine reads close to 70 ppm on the span gas, it’s ready for use; if not, it has to be adjusted. Each data set below represents some readings on span gas. Assume the Gaussian model,...

Compound Interest In Exercises 17 and 18, determine the time necessary for $1000 to double if...

Compound Interest In Exercises 17 and 18, determine the time necessary for $1000 to double if it is invested at interest rate compounded (a) annually, (b) monthly, (c) daily, and (d) continuously 17. r = 11% 18. r = 10 1/2%

a) Determine the amount of heat (q) necessary to heat 36.0 grams of ice (H2O (s))...

a) Determine the amount of heat (q) necessary to heat 36.0 grams of ice (H2O (s)) from the solid phase at –20°C to the liquid phase at 50°C. b) For each of the following processes or reactions, circle the appropriate choice to indicate whether ∆H for the process or reaction is less than or greater than zero. i) H2 (g) + ½ O2 (g) à H2O (l) ∆H < 0 ∆H > 0 (circle one) ii) H2O (g) à H2O...

determine the time of concentration for a flow which travels 50 m over average grass on...

determine the time of concentration for a flow which travels 50 m over average grass on a slope of 5 percent and 100 m over concrete pavement with a slope of 1 percent.

Determine the reaction order and the rate constant for the following data set: Time (s) 0...

Determine the reaction order and the rate constant for the following data set: Time (s) 0 50 100 150 200 250 Concentration (M) 0.01000 0.00887 0.00797 0.00723 0.00662 0.00611

Question