What matenal is present In steel at a temperature abbve 750°C7 Select one: O a Pearlite O D. Austenite OC. Bainite Od. Martensite

The rigid block of mass M is supported by the three symmetrically placed rods. The ends of the rods were level before the block was attached. Determine the largest allowable value of M if the properties of the rods are as listed (ow is the working stress): Element E (GPa) A (mm²) ow (MPa) Copper 120 900 70 Steel 200 1200 140

The assembly consists of a brass shell (1) fully bonded to a solid ceramic core (2). The brass shell [E = 115 GPa, a = 18.7 × 10-6/°C] has dout 50mm. and din = 35mm. The ceramic core [E = 290 GPa, α = 3.1 x 10-6/°C] has a diameter dout = 35mm. At a temperature of 15°C, the assembly is unstressed. AT = 60°C. Find the internal stress in the brass. = 200 mm Brass shell (1) (2) Ceramic core

10.The problem of ferritic steel is solveted by ... .... element to remain 11.The problem of weld-decay can overcomes by.. the distribution of ... through. 12.At the applications have high vibration. ..... .is most useful

A compound bar consisting of bronze, aluminum, and steel segments is loaded axially as shown in the figure. Determine the maximum allowable value P if the change in length of the bar is limited to 2 mm and the working stresses prescribed in the table are not to be exceeded. Aluminum 3P Bronze Steel 2P P 4P - 1.0 m- - 0.6 m→- ste-0.8 m - A (mm²) E (GPa) . (MPa) Bronze 450 83 120 Aluminum 600 70 80 Steel 300 200 140

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2.47 The rigid block of mass M is supported by the three symmetrically placed rods. The ends of the rods were level before the block was attached. Determine the M largest allowable value of M if the properties of the rods are as listed (a, is the working stress): E (GPa) A (mm²) a. (MPa) Соpper 120 900 70 Steel 200 1200 140 -1.0 m--1.0 m-- Iu 091 Jəddo) Steel uI 091 Jəddo)

The constant a for a steel material having an ultimate strength of 106.5 ksi is

Another of the steel components manufactured by michael's company is steel railway track sections. Thecomponent has a length of 120m (at a temperature of -10°C) and is to be exposed to a temperaturerange of -10°C to 55°C. In order to calculate the gaps which need to be left between the sections michael'scustomer needs to determine the maximum length which each railway track section will expand to andmichael have been asked to carry out the calculation for them. michael have also been instructed to determinethe percentage change in volume and surface area when exposed to the same initial and finaltemperatures. The customer has informed him that the cross sectional profile of the railway track isrectangular and of breadth 14cm and height 32cm. Assume the coefficient of thermal expansion ofsteel is 12x10-6 /°C. Briefly discuss the changes that occur with in the steel as a result of the change intemperature.

In which cast-iron carbon exists in the form of Fe;C? A gray B white C) nodular (spheroidal) D malleable