Nickel in steel (A) Improves wear resistance, cutting ability and toughness (B) Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties (C) Improves cutting ability a

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We wish to produce an 0.3 inch plate of oxygen-free, high-conductivity (OFHC) copper that has a yield strength of at least 45 ksi and elongation of at least 10%.  The original thickness of the plate is 3 inches.  The width of the plate remains the same during processing.  Which of the following procedures would give the correct final properties.  More than one answer is possible.   Group of answer choices Hot work from 3 to 0.5 inches; cold work from 0.5 to 0.3 inches Cold work from 3 to 1 inch; cold work from 1 to 0.5 inches; hot work from 0.5 to 0.3 inches Cold work from 3 to 1 inch; cold work from 1 to 0.4 inches; cold work from 0.4 to 0.3 inches Cold work from 3 to 1 inch; do full anneal; cold work from 1 to 0.5 inches; do full anneal; cold work from 0.5 to 0.3 inches Hot work from 3 to 0.4 inches; cold work from 0.4 to 0.3 inches None of the above will work Cold work from 3 to 0.3 inches Cold work from 3 to 1 inch; hot work from 1 to 0.4 inches; cold work from 0.4…

Q1: 1.5 in diameter steel part is quenched in oil with no agitation. (H=0.20). If we use a 4340; 4140; 8640; 5140; 1040 steel, what would be the hardness number at the center of the part? Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar, Given re n 4340 50 8640 9310 Sie 4320 1050 10 20 10 20 30 Jominy distance (th of an inch) TABLE Fhe N coeticiet ar severily af the quench, far several omehing med Cosling Ratethe Center Medium Coeicien O ne gato Otton 0 (re aghuion Ho laghatord Brire ne agtnoni tre agn 025 10 10 20 DIAMETER IN) HFACTOR Rockwell Channess

B- Describe the microstructure and mechanical properties produced in carbon steel which contain 0.5wt% carbon ,when subject to the following heat treatment:- 1- Heated to 870°C and water quenched to room temperature. 2- Heated to 870°C and furnace cooled to room temperature. 3- Heated to 870°C and cooled in air to room temperature.

Copper and copper alloys as specified by the Copper Development Association (CDA) and are designated as C00001 thru C99999 in the Unified Numbering System (UNS).  True  False An alloy steel designated as AISI 4130 WQT 700 means: chromium-molybdenum alloy steel containing .30% carbon in solution, that is through heat treated and water quenched.  True  False An AISI 4340 alloy steel contains .43 percent or 43 points of the element carbon in solution.  True  False Chemicals from which the commercially important plastic resins are derived are themselves derived from natural products that are quite plentiful; these raw materials include coal, water, limestone, sulfur, salt, and petroleum.  True  False There are two (2) types of polymerization; addition or linear and cross-linked or condensation. Addition polymers are thermoplastics and cross-linked polymers are thermosetting materials.  True  False

When a cold-worked metal is heat-treated below its melting point over a period of time, which of the following phenomena occur? (This question has more than one correct answer) a. Strength is increased b. Dislocation density decreases c. Grain size increases d. Internal lattice strains decrease e. Ductility is reduced

a: Quench to from 800oC to 350oC and hold for 102 seconds:b: Quench the alloy to room temperaturec: Reheat the alloy to 700oC and hold for 105 seconds

Define quenching. (a) What effects does it have on the microstructure? (b) How does this affect dislocation movement? (c) Why/how does this affect the properties?

1. What is wrought iron in gray? 2.  Why does gray cast iron lack tensile strength? 3. What can you do to give gray wrought iron a little toughness?