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 hardnessnumber at the center of the part?Q2: Determine the best quenching medium to produce a minimum hardnessof HRC 40 at the center of a 3.75 cm diameter 4320 steel bar,Givenre n43405086409310Sie432010501020102030Jominy distance (th of an inch)TABLE Fhe N coeticiet ar severily af the quench, far severalomehing medCosling Ratethe CenterMediumCoeicienO ne gatoOtton0 (re aghuionHo laghatordBrire ne agtnonitre agn025101020DIAMETER IN)HFACTORRockwell Channess

Answered: Q2: Determine the best quenching medium…

Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75S cm diameter 4320 steel bar.

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter2: Measurement, Materials, And Safety

Section2.7: Heat Treatment Of Metals

Problem 2RQ: Direct hardening can be performed on steel containing at least________ carbon.

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Concept explainers

Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.

Question

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

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