Effect of Silicon on Carbide Precipitation after Tempering of H11 Hot Work Steels
Effect of Silicon on Carbide Precipitation after Tempering of H11 Hot Work Steels
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DOI：
10.1007/s11661-010-0430-0
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
R. Mesquita;C. Barbosa;E. Morales;H. Kestenbach
中科院分区：
文献类型：
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作者：
R. Mesquita;C. Barbosa;E. Morales;H. Kestenbach
通过透射电子显微镜（TEM）研究了H11热作钢在898 K（625 °C）回火过程中二次碳化物的形成，并与先前确定的Si含量对机械性能的影响有关。观察到较低的Si含量（0.05和0.3%Si）和较高的Si含量（1.0和2.0%Si）产生不同的碳化物相和不同的颗粒分布。Cr，Mo和V在低Si钢中稳定的渗碳体颗粒被认为是负责类似的沉淀硬化效果相比，在较高Si钢中的M2C合金碳化物。低Si钢的高韧性是由于在淬火和回火马氏体组织中，富Cr的M_7C_3碳化物在板条间和包裹间分布更细、更均匀。硅含量对H11热作钢中合金碳化物形成的影响被认为是硅对低合金钢早期回火阶段众所周知的马氏体初始形成的延迟作用的结果。
The formation of secondary carbides during tempering of H11 hot work steels at 898 K (625 °C) was studied by transmission electron microscopy (TEM) and related to the previously established effects of Si content on mechanical properties. Lower Si contents (0.05 and 0.3 pct Si) and higher Si contents (1.0 and 2.0 pct Si) were observed to yield different carbide phases and different particle distributions. Cementite particles stabilized by Cr, Mo, and V in the lower Si steels were found to be responsible for similar precipitation hardening effects in comparison to the M2C alloy carbides in the higher Si steels. The much higher toughness of the lower Si steels was suggested to be due to a finer and more homogeneous distribution of Cr-rich M7C3carbides in the interlath and interpackage regions of the quenched and tempered martensite microstructure. The present effects of Si content on the formation of alloy carbides in H11 hot work steels were found to be the result of the retarding effect of Si on the initial formation of cementite, well known from the early tempering stages in low alloy steels.