Direct fabrication of high-performance high speed steel products enhanced by LaB6
Direct fabrication of high-performance high speed steel products enhanced by LaB6
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DOI：
10.1016/j.matdes.2016.09.044
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发表时间：
2016-12
影响因子：
8.4
通讯作者：
Qiankun Zhang;Jiang Yao;Wei-jun Shen;Huibin Zhang;Yuehui He;Lin Nan;Liu C.T.;Huang Han;Xiaolin Huang
中科院分区：
文献类型：
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作者：
Qiankun Zhang;Jiang Yao;Wei-jun Shen;Huibin Zhang;Yuehui He;Lin Nan;Liu C.T.;Huang Han;Xiaolin Huang
为实现高速钢的低污染、近终形、短流程生产，发展了一种无熔炼直接制造技术。该钢由以下组成（重量%）：6.4W、5.0Mo、4.2Cr、3.1V、8.5Co和1.28C作为示例性材料制造。绿色压坯在真空条件下活化反应烧结，活化能低，氧化还原反应增强扩散，孔隙周围合金元素浓度梯度的形成，促进了近完全致密化（> 99.40%）。此外，DFT钢显示出高纯度和上级机械性能。次强剂LaB 6（0.1重量%），该合金在DFT中易于准确引入，显著提高了DFT M3：2的热硬度、回火抗力、弯曲强度和韧性。硼原子和富镧络合物的强化作用是导致含LaB_6钢高温硬度和回火抗力提高的直接原因。
A direct fabrication technology (DFT) without smelting has been developed for fabricating sophisticated high speed steel products with low pollution, near-net shaping and short process. The steel consisting of (wt.%): 6.4W, 5.0Mo, 4.2Cr, 3.1V, 8.5Co and 1.28C, was fabricated as exemplary material. The activated and reactive sintering of green compacts under vacuum with low activation energy, redox reaction enhanced diffusion and the construction of concentration gradient of alloying elements around pores, promotes the nearly full densification (> 99.40%). Also, the DFT steels show high purity and superior mechanical properties. Minor strengthening agent LaB6(0.1 wt.%), which is easily to be accurately introduced in DFT, obviously increases the hot hardness, temper resistance, bend strength and toughness of DFT M3:2. The strengthening effect of boron atoms and La-rich complexes are proposed to directly result in the high hot hardness and temper resistance of LaB6containing steel.