Re: [MW:5511] RE: 5478] RE: 5437] Hardness of Untempered Martensite

Dear all,

What is meant for 4340,4140,8640,5140 and 1040 on the graph.It will be highly helpful if any one explain the graph in detail.Hope someone will take initiative.

Thanks and Regards

On Thu, Jun 10, 2010 at 9:36 AM, Warke, Robert <RobertWarke@letu.edu> wrote:

You're welcome, Mr. Babu. The previous figure does apply to alloy steels as well as to plain-carbon.

Alloy content in a ferritic steel strongly influences its hardenability, which is how easily martensite can be produced by quenching its austenite. Carbon content, on the other hand, determines the hardness of any martensite that is produced, and thus determines the maximum attainable hardness of a steel. The attached figure demonstrates both of these principles.

~RWW

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kathalingam Babu
Sent: Wednesday, June 09, 2010 7:53 PM

To: materials-welding@googlegroups.com
Subject: Re: [MW:5504] RE: 5478] RE: 5437] Hardness of Untempered Martensite

Mr.Robert,

Thanks,

Will this figure applicable to alloy steels ?

I assume that, it will applicable to plain carbon steels only.

Regards,

K.Babu

Singapore

----- Original Message -----

From: Warke, Robert

To: materials-welding@googlegroups.com

Sent: Wednesday, June 09, 2010 8:29 PM

Subject: [MW:5492] RE: 5478] RE: 5437] Hardness of Untempered Martensite

Mr. Babu,

The hardness of untempered martensite is determined almost entirely by its carbon content, as shown in the attached diagram.

Regards,

R. W. Warke

Robert W. Warke, P.E.
Associate Professor of
Welding & Materials Joining
School of Engineering & Engineering Technology

LeTourneau University

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kathalingam Babu
Sent: Tuesday, June 08, 2010 6:21 AM
To: materials-welding@googlegroups.com
Subject: [MW:5437] Hardness of Untempered Martensite

Hi

Any body have the idea on hardness for the untempered Martensite ?

What will be the morphology of micro?

Thanks & Regards,

K.Babu
Singapore

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