A hot rolling operation is being carried out on 250 mm wide and 25mm thick low carbon steel (C=165MPA, m=0.10) plate at 1000°C. The roll diameter is 450mm and it is rotating at 120 rpm. It is proposed that a reduction of 20% be taken in the rolling process. If the strain rate in the rolling processes can be expressed by the following expression: V. h. = 3 In L h, Where V, is the roll surface speed, ho is the intial thickness of the plate, hfis the final thickness of the plate and L is the contact length between the roll and plate in the deformation zone. Compute the flow stress required to deform the carbon steel plate.

A hot rolling operation is being carried out on 250 mm wide and 25mm thick low carbon steel (C=165MPA, m=0.10) plate at 1000°C. The roll diameter is 450mm and it is rotating at 120 rpm. It is proposed that a reduction of 20% be taken in the rolling process. If the strain rate in the rolling processes can be expressed by the following expression: V. h. = 3 In L h, Where V, is the roll surface speed, ho is the intial thickness of the plate, hfis the final thickness of the plate and L is the contact length between the roll and plate in the deformation zone. Compute the flow stress required to deform the carbon steel plate.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

A hot rolling operation is being carried out on 250 mm wide and 25mm thick low carbon steel
(C=165MPA, m=0.10) plate at 1000°C. The roll diameter is 450mm and it is rotating at 120
proposed that a reduction of 20% be taken in the rolling process.
rpm.
It is
If the strain rate in the rolling processes can be expressed by the following expression:
V,
h.
= 3
L
h,
Where V, is the roll surface speed, ho is the intial thickness of the plate, hfis the final thickness of the
plate and L is the contact length between the roll and plate in the deformation zone.
Compute the flow stress required to deform the carbon steel plate.

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