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Quench and temper - Lab Report Example

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Quench and temper

Objective This paper seeks to investigate the effects of quenching and tempering on hardness and impact properties of steel. It experimentally subjects different pieces of steel to different tempering conditions to determine the effects of quenching, and tempering temperature on steel’s impact strength and hardness. Results The following tables summarize the results for the materials’ hardness readings and impact strength. Rockwell hardness readings unmarked 19.4 19.7 19.9 20.4 20.1 19.9 red 30.5 31.1 31.4 31.2 30.4 30.92 blue 48.4 48.3 48.2 48.1 48.2 48.24 yellow 54 54.4 54.7 49.8 54.4 53.46 Material impact strength material impact strength (ft lb) unmarked 14 red 61.5 blue 17.8 yellow 18 Discussion The experiment selected four pieces of steel and designated them as unmarked, red, blue, and yellow. The unmarked piece was left untreated while the red designate was quenched and then tempered for three hours at a temperature of 1000 F. The blue designate was quenched and then tempered for three hours at a temperature of 600 F while the yellow designate was quenched, and tempered for three hours at a temperature of 350 F. The procedure was repeated several times for each condition. The results show different values for every experimental reading on Rockwell’s hardness. ...
e of Variation SS df MS F P-value F crit Between Groups 4329.228 3 1443.076 1567.539 6.85E-24 3.098391 Within Groups 18.412 20 0.9206 Total 4347.64 23         The small probability value identifies significant difference

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between groups for each of the material treatments, leading to the conclusion that the temprature to which a material is subjected during tempering determines its attained hardness. The results also show that the attained hardness is inversely proportional to temperature at the tempering stage. The resultant material impact effect is also inversely proportional to the temperature at the tempering stage, though a deviation is at 1000 F. This can however be attributed to experimental error. Quenching and tempering is one of the approaches to achieving strength within materials such as steel. Quenching involves heating a metal to very high temperatures followed by a sudden cooling for increased strength. The tempering process that reduces the material’s brittleness to ensure strength and durability then follows this. The first step in a quench and temper process is the intense heating that that aims at ensuring homogeneity of the steel’s elements and requires a temperature that is above the component’s transformation potential. This therefore eliminates possible asymmetries that reduce strength of normal steel. The sudden cooling then yields a “body centered ‘martensite’, which is hard” but is brittle (Black and Kohser, p. 133). The temper process however, defines a reheating of the material, at moderate temperatures to reduce the brittleness towards more malleable material (Palmer and King, p. 61). The achieved strength of the material however depends on a number of factors. One of the factors that determine the achieved strength, and

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Mechanical Engineering Technology Materials Testing Laboratory Experiment Title: Quench and temper Experiment Number: Section: Name of Principal Author: Names of Contributors: Instructor Name: Quench and temper Abstract This experiment explores the effect of tempering and the tempering temperature on hardness and strength of steel…
Author : bemard
Quench and temper essay example
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