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The results show that the microstructure of the cast iron without being RE modified is mostly coarse-grained austenite and network carbides at the grain boundary. 結(jié)果表明，未經(jīng)稀土變質(zhì)処理的鑄鉄組織大部分爲(wèi)粗晶粒奧氏躰，還有分佈於晶界的網(wǎng)狀碳化物；