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  3. b which steels can be quenched in agitated oil to...

Question: b which steels can be quenched in agitated oil to...

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b) Which steels can be quenched in agitated oil to produce a minimum hardness of 30 HRC in the middle of a 1.5-inch diameter bar. Support your choices with construction lines on the provided figures.

c) Only 1-inch thick rectangular bar is available for 4140 ally steel. To control distortion the bar cannot be quenched in brine. Can this rectangular bar be used to obtain a minimum hardness of 50 HRC in its center? If yes, which quenchant(s)? Support your choice with construction lines on the provided figures.

d) What diameter of steel bar quenched in brine will have the same cooling rate as a 1.0-inch diameter steel bar quenched in agitated oil? Support your choices with construction lines on the provide Figures

2.5 Question B Question C 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0 0 Jominy distance (in.) Jominy distance (in.) Grossman Graph Relating Jominy Distance to Bar Diameter for Different Quenchants 60 60 4140 4140 エ40 I 40 9310 9310 20 Question B Question C 0 0.2 04 0.6 08 10 14 1.6 18 DISTANCE FROM QUENCHED END, inch 0 02 04 06 08 10 14 1.6 18 DISTANCE FROM QUENCHED END, inch Jominy Curves Comparing Steel Hardenability SOLIDS, LENGTH L 2.5 HEXAGON RECTANGULAR OR PLATE Question D ER T ER IIT ER-1.25 T ER-1.5T WHEN L LESS THAN T. CONSIDER SECTION AS A PLATE OF L THICKNESS1.5 ESTRCTED OR CLOSED AT ONE OR BOTH ENOS UBE (ANY SECTION ) OPEN BOTH END 0.5 ER 2 NOTE WHEN L IS LESS THAN ER 2.5T WHEN D IS LESS THAN 2.5 D, CONSIDER AS A PLATE OF T THICKNESS. WHEN L IS LESS ER 35TWHEN D IS GREATER THAN 2. THAN T, CONSIDER SECTION AS APLATE OF L THICKNESS NCHES 0 곪落읊흖18 Jominy distance (in.)

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