17. Consider the iron-carbon phase diagram in Figure A Damascus blades have an a

Question

17. Consider the iron-carbon phase diagram in Figure A

Damascus blades have an approximate carbon content of 1.5 wt.%.

e. What phase(s) is(are) present in Damascus steel above 1000?C? f. What phase(s) is(are) present in Damascus steel above 727?C, but below 1000?C? g. What phase(s) is(are) present in Damascus steel below 727?C? h. At room temperature, what mass fraction of cementite is present? i. At room temperature, what mass fraction of ferrite is present?

Atomic percentage, carboin 10 oC 2 15 20 25 1,700 1,600 1,500 1,400 1,300 1,200 1,100 1,000 900 800 700 600 500 400 300 200 100 0 1,538 1,495° 1,394 1,227°C 1,148° L + Fe3C (austenite) 2.11 4.30 6.69 9120 + Fe3C 727 0.02 0.77 Fe3C (cementite) (ferrite) + Fe3C Fe 1.5% weight percentage, carbon o/ Weight percentage, carborn

Explanation / Answer

17.e.
Above 1000 deg C, the phases present are
gamma austenite, gamma + Fe3C, L+Fe3C, gamma + L and L
f. Between 727 and 1000 deg C,
the phases present are
gamma austenite and gamma + Fe3C,
g. Below 727 deg C,
the phases present are
alpha (ferrite), alpha+ Fe3C and Fe3C(cementite)

h. At room temperatuer, 6.7 mass percent of carbon is present

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