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首页> 外文期刊>ISIJ international >Role of Lanthanum Addition on Acicular Ferrite Transformation in C–Mn Steel
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Role of Lanthanum Addition on Acicular Ferrite Transformation in C–Mn Steel

机译：镧对C-Mn钢针状铁素体转变的作用

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Acicular ferrite formation in C–Mn steel after rare earth La addition and the potency of different La-containing inclusions inducing the formation of acicular ferrite have been investigated. It was found that there would be a large amount of acicular ferrite in quenched steel after 0.020 mass% La additions. The size of effective inclusion for acicular ferrite nucleation is mainly 1–4 μ m. The best single La-containing effective inclusion is La_(2)O_(2)S. When MnS attached to the surface of La_(2)O_(2)S forming complex inclusion, the potency of inclusion on nucleating acicular ferrite is enhanced significantly. Low lattice mismatch between α –Fe and La_(2)O_(2)S plays an important role on acicular ferrite nucleation. When patches of MnS precipitated on the surface La_(2)O_(2)S forming the complex inclusion, the main mechanism for that inclusion is the combine of low degree of lattice mismatch and existing of Mn-depleted zone.
机译：研究了稀土镧添加后C-Mn钢中针状铁素体的形成，以及不同的含La夹杂物诱导针状铁素体形成的作用。发现添加0.020质量％La后，淬火钢中会存在大量针状铁素体。针状铁素体形核的有效夹杂物尺寸主要为1-4μm。最佳的单一含La的有效夹杂物是La_（2）O_（2）S。当MnS附着在La_（2）O_（2）S的表面形成复合夹杂物时，夹杂物在针状铁素体成核上的能力显着增强。 α–Fe和La_（2）O_（2）S之间的低晶格失配在针状铁素体成核中起重要作用。当MnS片状沉淀物在表面La_（2）O_（2）S上形成复合夹杂物时，该夹杂物的主要机理是晶格失配程度低和存在Mn耗尽区的结合。

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