Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Blacksmithing & Forming

SFT Search:   
Thread Tools Display Modes
Old 06-03-2006, 02:44 AM
Shade Tree Welder's Avatar
Shade Tree Welder Shade Tree Welder is offline
Grumpy Bastard
Join Date: Jun 2004
Location: Kankakee County, IL
Posts: 20,379
Default Martensite Transformation and Retained Austenite (One Minute Mentor)

I have been getting these emails from ASM International.

June 2, 2006

The martensite start temperature (Ms), the temperature at which austenite begins to transform to martensite, decreases significantly with increasing carbon content in Fe-C alloys and carbon steels. The martensite finish temperature (Mf), or temperature at which the martensite transformation is complete in a given alloy, also is a function of carbon content, and drops below room temperature in alloys containing more than about 0.3% carbon. Therefore, significant amounts of untransformed austenite, especially in high-carbon steels, may be present with martensite at room temperature. Even in alloys containing only 0.3 to 0.4% carbon, some small amount of austenite is retained. Alloying elements that stabilize austenite increase the amount of retained austenite at any given carbon level and temperature.
Past One Minute Mentors
Attached Files
File Type: pdf Retained austenite.pdf (40.4 KB, 383 views)

"Prepare to defend yourselves."
-- Sergeant Major Basil L. Plumley, Ia Drang Valley
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Web Search:

All times are GMT -5. The time now is 11:39 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.