如题所述
如图示:铁碳合金相图局部,由于含碳量未知,先设含碳量为CX,铁素体的质量为WF,珠光体的质量为WP,根据杠杆定律,可列式子如下:
WF PO=WP OS (典型的杠杆定律形式),由于WF +WP=1,故,WF =1-WP 带入得:
(1-WP)PO=WP OS,乘进去→ PO-WP PO=WP OS 移项→ PO=WP PO+WP OS,PO=WP(PO+OS)=WP PS,即:PO=WP PS,
PO=CX-0.0218, PS=0.77-0.0218=0.7482,WP=60%=0.6,带入上式,得:
CX- 0.0218 = 0.6×0.7482
CX = 0.6×0.7482+ 0.0218=0.44892+ 0.0218=0.47062
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