Effect of compound addition of Nb-B on hot ductility of Cr-Mo alloy steel
Effect of compound addition of Nb-B on hot ductility of Cr-Mo alloy steel
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Nb-B复合添加对Cr-Mo合金钢热塑性的影响
DOI：
10.1016/j.msea.2018.01.001
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发表时间：
2018-02
期刊：
影响因子：
6.4
通讯作者：
Li Yongliang
中科院分区：
文献类型：
--
作者：
Zheng Yaxu;Wang Fuming;Li Changrong;Cheng Jin;Li Yongliang
在700-1100 °C温度范围内，以0.5 s−1的应变速率进行热拉伸试验，研究Nb和B对25 CrMo合金钢热塑性的综合影响。此外，还利用OM、FE-SEM、TEM、AES和西姆斯等手段研究了动态再结晶晶粒长大行为、铁素体相变、析出相和B非平衡偏聚对热塑性的影响。结果表明，随着变形温度的升高，Nb（C，N）颗粒的数量逐渐减少。BN在Nb（C，N）颗粒上的析出，使Nb（C，N）颗粒大量地在基体中而不是在晶界上析出，从而降低了作用在晶界上的应力，而BN在Nb（C，N）颗粒上析出的粗化颗粒降低了细小Nb（C，N）颗粒对位错的钉扎作用。在γ+α两相区，除Nb（C，N）和BN颗粒外，还存在M2 B、M23 C6和M7 C3析出相。Nb和B复合添加改善单相奥氏体区热塑性的机理是：Nb和B的加入虽然延缓了动态再结晶，但明显细化了动态再结晶晶粒。同时，B原子向晶界快速偏聚，占据晶界空隙，增强晶界结合力。此外，BN颗粒在基体中而不是在晶界处沉淀在Nb（C，N）颗粒上，减少了对热塑性的不利影响。γ+α两相区热塑性的提高主要是由于B的加入抑制了铁素体的相变和变形诱发碳化物的析出，消耗了奥氏体中的强化合金元素。
The hot tensile tests were conducted in this study to investigate the combined effect of Nb and B on hot ductility of 25CrMo alloy steel in temperature range of 700–1100 °C with a strain rate of 0.5 s−1. Besides, the influences of DRX grains growth behavior, ferrite transformation, precipitates and B non-equilibrium segregation on hot ductility were also investigated by use of OM, FE-SEM, TEM, AES and SIMS. The results indicated that the amount of Nb(C,N) particles decreased with increasing deformation temperatures. Moreover, the precipitation of BN on Nb(C,N) particles, which precipitated in matrix abundantly rather than at grain boundaries, reduced stress acting on grain boundaries, and the coarsening BN particles precipitating on Nb(C,N) reduced the pining effect of fine Nb(C,N) particles on dislocations. Besides Nb(C,N) and BN particles, there were M2B, M23C6and M7C3precipitates in γ+α two-phase region. The mechanism for hot ductility improvement by compound addition of Nb-B in single phase austenite region was that although the DRX was retarded, the DRX grains were refined obviously by adding Nb and B. Meanwhile, the B atoms segregated rapidly to grain boundaries occupying the voids and enhancing grain boundary cohesion. Besides, the BN particles, precipitating on Nb(C,N) particles in matrix rather than at grain boundaries, reduced the adverse effects on hot ductility. The improvement of hot ductility in γ+α two-phase region was attributed to the restraint of ferrite transformation by the addition of B and the deformation induced precipitation of carbides, which consumed strengthening alloy elements in austenite.
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影响因子：
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作者：
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通讯作者：
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DOI：
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DOI：
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影响因子：
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