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如图为Fe-Fe3C亚稳状态图,已知碳(C)于727℃和室温下在Fe中固溶度分别为0.0218%和0.0008%(重量)。 则图中HJB,ECD,PSK的三相平衡反应式的温度和成分正确的说法有()。
A.HJB,1495℃:δ(0.09%C)+L(0.53%C)→γ(0.17%C)
B.ECD,1148℃,L(4.3%C)→γ(2.11%C)+Fe3C(6.69%C)
C.PSK,727℃,γ(0.77%C)→α(0.0218%C)+Fe3C(6.69%C)
D.PSK,727℃,γ(0.77%C)→α(0.0008%C)+Fe3C(6.69%C)
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