ME 111L Lab Unit 3 - Intro (group)

ME 111L Lab Unit 3 - Intro (group) - phase) above the...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
3.) Introduce TTT diagram for isothermal transformation of 4140 steel and state what’s transforming and what the products are. We are isothermally transforming six 4140 tensile specimens and six Charpy V-notch specimens that were all initially austenitized in the furnace at 850 0 C. One tensile specimen and one impact specimen is isothermally transformed at 700 0 C for 2 hours, 660 0 C for 1 hour, 620 0 C for 1.5 hours, 460 0 C for 1 hour, and 360 0 C for 1 hour. The final tensile and impact specimens from the 850 0 C furnace are quenched in oil. During austenitizing of the 12 specimen, the steels were completely transformed to austenite (the
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: phase) above the eutectic temperature. Austenite can decompose into pearlite + proeutectoid phase, bainite, or martensite. The 700 C isothermally transformed steel specimens were transformed into coarse pearlite upon rapid cooling. The 660 C specimens transformed into medium pearlite. The 620 C transformed into fine pearlite. The 460 C transformed into upper bainite. The 360 C transformed into lower bainite. And the oil quenched specimens transformed into martensite. References Azom Materials, 2000 <>...
View Full Document

This note was uploaded on 02/14/2010 for the course ME 111L taught by Professor Ciulik during the Spring '10 term at University of Texas at Austin.

Ask a homework question - tutors are online