Enhanced hardening by multiple microalloying in low carbon ferritic steels with interphase precipitation
Enhanced hardening by multiple microalloying in low carbon ferritic steels with interphase precipitation
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通过多种微合金化在低碳铁素体钢中通过相间沉淀来增强硬化
DOI：
10.1016/j.scriptamat.2022.114558
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发表时间：
2022
影响因子：
6
通讯作者：
Furuhara Tadashi
中科院分区：
文献类型：
--
作者：
Zhang Yongjie;Miyamoto Goro;Furuhara Tadashi
研究了V微合金化低碳钢中添加Nb或Ti时的相间析出行为及由此产生的硬化。923 K等温转变后，合金碳化物由碳化物形成元素的相间同时析出形成，早期富集的是Nb或Ti，而不是V，因为它们的析出驱动力更大。当在相同的微合金化添加总量下进行比较时，多次添加的合金中的合金碳化物的数量密度和尺寸以及由此产生的铁素体的硬度都介于单次添加的对应物之间。具有不同碳化物形成倾向的元素的多元微合金化的优点被概括为在可接受的初始化温度下同时建立高的数密度和大的合金碳化物体积分数，所述可接受的初始化温度要求所添加的碳化物形成元素完全溶解。
The interphase precipitation behaviors and resultant hardening in V-microalloyed low carbon steels combined with Nb or Ti addition were investigated. After isothermal transformation at 923 K, alloy carbide is formed by simultaneous interphase precipitation of carbide-forming elements, with the enrichment of Nb or Ti rather than V at the early stage due to their larger driving force for precipitation. When compared at the same total amount of microalloying addition, both number density and size of alloy carbide, as well as resultant hardness of ferrite in the multiple-added alloys are in between those of the single-added counterparts. The advantage of multiple microalloying of elements with different carbide-forming tendency is summarized to be the co-establishment of high number density and large volume fraction of alloy carbide with acceptable austenitizing temperature required for complete dissolution of the added carbide-forming elements.