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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)處理的鑄鐵組織大部分為粗晶粒奧氏體，還有分布于晶界的網(wǎng)狀碳化物；