what are cast irons? What are roles of Si and Mg in cast irons?
what are cast irons? What are roles of Si and Mg in cast irons?
Homework Answers
Answer : A group of iron-carbon alloys which are brittle, have low melting temperatures and 2-4% carbon content are known as cast irons. They contain varying amounts of magnesium and silicon along with trace amount of impurities such as phosphorus and sulphur. Si and Mg in the cast irons reduce the elongation and increase the strength of the cast irons. Si helps to force carbon out of the solution.
Which of the following represent the two-phase microstructure found in some steels and cast irons that...
Which of the following represent the two-phase microstructure found in some steels and cast irons that result from the transformation of austenite with the eutectoid composition and consist of alternating layers called lamellae? Select all that apply. G+ Primary ferrite + cementite Pearlite Ferrite + cementite Proeutectoid cementite + austenite Proeutectoid ferrite + austenite a + Fe3C O 7+ Fe3C
1. Observe the microstructure of three given cast irons samples (1. 2 and 3) using optical...
1. Observe the microstructure of three given cast irons samples (1. 2 and 3) using optical microscopy and then a) Identify each of them from their key microstructural features from micrograph. b) Specify your reasons for identification and compare their mechanical properties. C) Schematically draw the microstructures and mark all the microstructural features. 100 um Sample 2 100 um Sample DEM
1. Observe the microstructure of three given cast irons samples (1, 2 and 3) using optical...
1. Observe the microstructure of three given cast irons samples (1, 2 and 3) using optical microscopy and then a) Identify each of them from their key microstructural features from micrograph. b) Specify your reasons for identification and compare their mechanical properties. c) Schematically draw the microstructures and mark all the microstructural features. 100 um Sample 2 100 um Sample
1. Observe the microstructure of three given cast irons samples (1, 2 and 3) using optical...
1. Observe the microstructure of three given cast irons samples (1, 2 and 3) using optical microscopy and then a) Identify each of them from their key microstructural features from micrograph. b) Specify your reasons for identification and compare their mechanical properties. c) Schematically draw the microstructures and mark all the microstructural features. ampie 1 Sample 2 100 um Sample 100 um 2. Observe the microstructure of the given two steel samples with a carbon composition of 0.2 wt.% and...
What are the roles of government agencies in the conservation of biodiversity? What are the roles...
What are the roles of government agencies in the conservation of biodiversity? What are the roles of private conservation organization in the conservation of biodiversity? What are the roles of businesses in the conservation of biodiversity? What are the roles of community groups in the conservation of biodiversity? What are the roles of individuals in the conservation of biodiversity? Can they all work together, or are their interests necessarily opposed to each other?
Complete the following reaction: Mg-20 decomposes to a proton, an alpha particle, and ?? A) Si-29...
Complete the following reaction: Mg-20 decomposes to a proton, an alpha particle, and ?? A) Si-29 B) Si-28 C) Na-28 D) Al-28
As we saw in prior chapters, metals can play a variety of roles in catalysis. What...
As we saw in prior chapters, metals can play a variety of roles in catalysis. What are the roles of magnesium ion in hexokinase, glucokinase, and phosphoglycerate kinase? The Mg helps hold the enzyme in the correct conformation. The Mg helps hold ADP/ATP in the correct conformation. The Mg helps hold the substrate in the correct connformation It serves as a REDOX partner. It helps stabilize the ES complex by balancing charge in the active site It coordinates to the...
Assume that two 2-mm thick cast-iron sheets are being spot-welded at a current of 5000 A...
Assume that two 2-mm thick cast-iron sheets are being spot-welded at a current of 5000 A and over a current flow time of 0.1 second by means of electrodes 2.5 mm in diameter. Estimate the heat generated and its distribution in the weld zone if the effective resistance in the operation is 2002 Only provide your final answers herg Approximate Specific Energies Required to Malta Unit Volume of commonly Welded Metals Specific energy Material Aluminum and its alloys 2.9 Cast...
A common mineral in Earth’s crust has the chemical composition 34.55% Mg, 19.96% Si, and 45.49%...
A common mineral in Earth’s crust has the chemical composition 34.55% Mg, 19.96% Si, and 45.49% O by mass. What is its empirical formula? please show your steps
arrange the following species in order of decreasing radius. a. c, mg, ca, si b. sr,...
arrange the following species in order of decreasing radius. a. c, mg, ca, si b. sr, cl,br, i
Which of the following represent the two-phase microstructure found in some steels and cast irons that result from the transformation of austenite with the eutectoid composition and consist of alternating layers called lamellae? Select all that apply. G+ Primary ferrite + cementite Pearlite Ferrite + cementite Proeutectoid cementite + austenite Proeutectoid ferrite + austenite a + Fe3C O 7+ Fe3C
1. Observe the microstructure of three given cast irons samples (1. 2 and 3) using optical microscopy and then a) Identify each of them from their key microstructural features from micrograph. b) Specify your reasons for identification and compare their mechanical properties. C) Schematically draw the microstructures and mark all the microstructural features. 100 um Sample 2 100 um Sample DEM
1. Observe the microstructure of three given cast irons samples (1, 2 and 3) using optical microscopy and then a) Identify each of them from their key microstructural features from micrograph. b) Specify your reasons for identification and compare their mechanical properties. c) Schematically draw the microstructures and mark all the microstructural features. 100 um Sample 2 100 um Sample
1. Observe the microstructure of three given cast irons samples (1, 2 and 3) using optical microscopy and then a) Identify each of them from their key microstructural features from micrograph. b) Specify your reasons for identification and compare their mechanical properties. c) Schematically draw the microstructures and mark all the microstructural features. ampie 1 Sample 2 100 um Sample 100 um 2. Observe the microstructure of the given two steel samples with a carbon composition of 0.2 wt.% and...
Assume that two 2-mm thick cast-iron sheets are being spot-welded at a current of 5000 A and over a current flow time of 0.1 second by means of electrodes 2.5 mm in diameter. Estimate the heat generated and its distribution in the weld zone if the effective resistance in the operation is 2002 Only provide your final answers herg Approximate Specific Energies Required to Malta Unit Volume of commonly Welded Metals Specific energy Material Aluminum and its alloys 2.9 Cast...
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