×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment
2

Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment

Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment

(OP)
Dear all,

First of all I will describe my current situation.
I am starting an internship on a new company, I am still on my third day, but an accident happened and as I am the only one here who has any knowledge on materials the responsible engineer came up to me and asked me the following question:

"I am doing an FEA to investigate the cause of the accident and I want to know if there is a way to find out a table or any reference correlating the hardness of a 8640 steel with the yield and ultimate tensile strength after certain heat treatment, knowing the properties before the treatment and the hardness post heat-treating? Assuming that I know the heat treatment"

I know that is too little information, but it would be of great help if anyone could give any advice.

Matheus

RE: Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment

I did a quick Knovel search and think ASM Handbook, Volume 4 Heat Treating, section 13.4 might have some of the information you're looking for. Hope that helps!

RE: Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment

It really depends a lot on what the "certain heat treatment" was, or perhaps more percisely, how well it is defined.

RE: Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment

(OP)
Thank you that was of great help!

RE: Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment

You're very welcome Matheus! I have a question too if you don't mind - I'm in the process of putting together some materials to help ramp up new engineers, and am curious as someone starting out, what type of information do you most urgently need to do your job, and what/where do you current look for that research and information?

RE: Clarification about correlation of yield strength and hardness of a 8640 steel after heat treatment

Matheus,

ISO 18265 shows a number of hardness conversions and their approximate tensile strength for steels. For quenched and tempered steels in the range of ~ 22 to 60 HRC, the ratio of yield strength to tensile strength is in the range of 90-98%, with 90-95% being typical up to ~ 45 HRC and 95-98% for steels > 45 HRC. You can obtain ISO 18265 directly from ISO or from a licensed vendor such as IHS:

http://www.iso.ch

http://global.ihs.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources