10.5 PREHEATING
API ICP Self Study Notes
API ICP Self Study Notes
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c) 50% coarse pearlite + 25% bainite + 25% martensite: To do this, we will<br />
need to have a three step process. First, cool to a temperature above the<br />
nose of the IT curve and hold until you have converted 50% of the austenite<br />
to coarse pearlite. Second, rapidly cool to a temperature below the nose, but<br />
above the M start temperature, and hold until 50% of the remaining austenite is<br />
converted to bainite (this makes 50% of 50% = 25% bainite). Finally, rapidly<br />
quench through the Mf temperature to completely convert the remaining<br />
austenite to martensite