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What is DBTT?. Property of steelChange in metal behaviorCritical design factor. Figure 1
FINDING THE DUCTILE-BRITTLE TRANSITION TEMPERATURE IN STEEL

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1. FINDING THE DUCTILE-BRITTLE TRANSITION TEMPERATURE IN STEEL

2. What is DBTT? Property of steel Change in metal behavior Critical design factor

3. Charpy Impact Test Measures the fracture energy of a metal Standardized in ASTM standard E-23 Identifies the DBTT of metals Shows brittle or ductile fracture behavior

4. Equipment Impact machine Specimens machined to ASTM E-23 Furnace Methanol bath refrigerator Boiling water bath Ice water bath Liquid nitrogen

5. Experimental Procedure Select 6 or more test temperatures Heat or cool two specimens to each temperature Wear safety glasses Prepare the impact machine Load the the specimen into the machine (only five seconds are allowed to move the specimen) Break specimen

6. Experimental Procedure (continued) Record the absorbed energy Stop hammer and retrieve specimen Label the specimen Repeat test for remaining specimens

7. Data Analysis Plot temperature vs. absorbed energy Draw a curve through the points DBTT is mean of upper and lower shelf energy

8. References Charpy Impact machine picture Retrieved August 12, 2002 from http://www.cpcc.cc.nc.us/mech/equipment/impact.jpg ASM metals Handbook, Vol. 19, 9th Ed., p.630 Bassett, Vicki Causes and Effects of the Rapid Sinking of the Titanic Retrieved August 12, 2002 from http://fbox.vt.edu/eng/mech/writing/uer/bassett.html


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