张建涛,陈业新,强小妮.硼含量对Ni3(Si,Ti)合金在空气中环境氢脆的作用[J].有色金属工程,2018,8(3):.
硼含量对Ni3(Si,Ti)合金在空气中环境氢脆的作用
Effect of B content on environmental hydrogen embrittlement of Ni3(Si,Ti) alloys
投稿时间:2017-03-01  修订日期:2017-03-28
DOI:
中文关键词:  硼含量  Ni3(Si,Ti)合金  力学性能  环境氢脆
英文关键词:boron content  Ni3(Si,Ti) alloy  mechanical property  environmental hydrogen embrittlement
基金项目:国家自然科学基金资助(项目号51271102)
        
作者单位
张建涛 上海大学材料研究所
陈业新 上海大学材料研究所
强小妮 上海大学材料研究所
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中文摘要:
      硼含量(CB £ 0.1 wt.%)对Ni3(Si,Ti)合金的相组织、合金在真空和空气环境中的力学性能及合金的环境氢脆敏感性存在较大作用,研究结果表明:添加硼原子可使Ni3(Si,Ti)合金的晶粒尺寸细化。微量(CB £ 0.02 wt.%)硼原子有效提高了合金在空气中的力学性能,与无硼Ni3(Si,Ti)合金相比,添加0.005 wt.%B可使合金在空气中的延伸率提高198 %。当硼含量为0.02 wt.%时,合金在真空和空气中的抗拉强度和延伸率均达到最大值,合金的断口形貌为完全韧窝状断口,合金的氢脆因子降至1.5 %,硼原子基本上完全抑制了Ni3(Si,Ti)合金在空气中的环境氢脆。当合金中硼含量大于0.02 wt.%后,Ni3(Si,Ti)合金中析出TiB2相。而且,随着硼含量(CB > 0.02 wt.%)增加,TiB2相的数量随之增多,合金在真空和空气中的力学性能随之降低,合金在空气中的氢脆因子随之升高,合金在空气中的断口形貌由完全韧窝状断口又转变为穿晶与解理的混合断口。
英文摘要:
      There is a great effect of boron on the microstructure of Ni3(Si,Ti) alloy, the mechanical properties and the environmental hydrogen embrittlement of the alloy when boron content CB £ 0.1 wt.%. The result show that the grain size of the alloy is decreased when doped boron in the Ni3(Si,Ti) alloy. The mechanical properties of the alloy in air are improved effectively by trace boron, the elongation of Ni3(Si,Ti)-0.005 wt.%B alloy is increased by 198 % compared with the boron-free Ni3(Si, Ti) alloy when tested in air. The strength and elongation of the Ni3(Si,Ti)-0.02 wt.%B alloy reach maximum when the alloy tested in vacuum and air, the fracture surface of the alloy is completely dimple fracture, and the hydrogen embrittlement factor of the alloy is only 1.5%, i.e., the environment hydrogen embrittlement of Ni3(Si,Ti) alloy in the air is suppressed completely. However, when the boron content in the alloy is more than 0.02 wt.%, TiB2 phase precipitates in the Ni3(Si,Ti) alloy. Moreover, the amount of TiB2 phase increases with the increase of boron content (CB > 0.02), resulting that the mechanical properties of the alloy decrease in vacuum and air, the hydrogen embrittlement factor of the alloy increases and the fracture mode of the alloy changes from full transgranular to mixed farcture of intergranular and transgranular.
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