Du Hailong, An Na, Wang Xiyan, Li Yongliang, Liu Zhiyong, Jin Aibing, Yang Renshu, Pan Yue, Li Xiaogang
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Technology Research Institute of Shanxi Jincheng Coal Group Co., Ltd., Jincheng 048000, China.
Materials (Basel). 2023 Aug 31;16(17):5965. doi: 10.3390/ma16175965.
This work explored a new idea for enhancing the resistance to stress corrosion cracking (SCC) of mining anchor steel through microalloying. Microalloyed anchor steels with Nb, Cu, Ni, Sb, and C were prepared through vacuum smelting and hot rolling. Electrochemical measurements, slow strain rate tensile (SSRT) tests, and fracture morphology observations were used to study the electrochemical and SCC behavior in the simulated mine environment. The results proved that the microstructure of microalloyed steels varies slightly. Adding Ni, Cu, and Sb can improve the mechanical properties of the anchor steel, while reducing C content decreases tensile strength as a result of loss of the solution-strengthening effect. The addition of Sb, Cu, Ni, and reducing the content of C enhances the resistance to corrosion and SCC by mitigating anodic dissolution (AD), while adding Nb improves SCC resistance by inhibiting hydrogen embrittlement (HE). The combined addition of 1% Ni, 0.5% Cu, 0.05% Nb, 0.1% Sb, and 0.5% C presented the highest SCC resistance, which is a promising prospect for the development of high-performance, low-alloy anchor steels. The combined addition of 1% Ni, 0.5% Cu, 0.05% Nb, and 0.1% Sb resulted in the inhibition of electrochemical reactions and corrosion. As a result of the synergistic effect of the microalloy, both AD and HE mechanisms were simultaneously inhibited, which greatly enhanced SCC resistance.
本研究通过微合金化探索了一种提高矿用锚杆钢抗应力腐蚀开裂（SCC）性能的新思路。通过真空熔炼和热轧制备了含Nb、Cu、Ni、Sb和C的微合金化锚杆钢。采用电化学测量、慢应变速率拉伸（SSRT）试验和断口形貌观察等方法研究了模拟矿井环境中的电化学行为和应力腐蚀开裂行为。结果表明，微合金化钢的微观组织变化不大。添加Ni、Cu和Sb可提高锚杆钢的力学性能，而降低C含量会因固溶强化作用的丧失而降低抗拉强度。添加Sb、Cu、Ni以及降低C含量可通过减轻阳极溶解（AD）来提高耐腐蚀性能和抗应力腐蚀开裂性能，而添加Nb则通过抑制氢脆（HE）来提高抗应力腐蚀开裂性能。1%Ni、0.5%Cu、0.05%Nb、0.1%Sb和0.5%C的复合添加表现出最高的抗应力腐蚀开裂性能，这为高性能低合金锚杆钢的开发提供了广阔前景。1%Ni、0.5%Cu、0.05%Nb和0.1%Sb的复合添加抑制了电化学反应和腐蚀。由于微合金的协同作用，阳极溶解和氢脆机制同时受到抑制，从而大大提高了抗应力腐蚀开裂性能。
