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采用真空电弧熔炼炉制备了Ti-xN (x=0、0.02%、0.03%、0.05%、0.1%、0.2%和0.3%,质量分数)钛氮合金，借助光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)及万能试验机对铸态钛氮合金的显微组织与力学性能进行了研究。结果表明：随着氮元素含量的增加，合金中针状α相的数量增多，尺寸减小。当氮含量小于0.05%时，其在钛中形成了间隙固溶体，当氮含量为0.05%时，合金中开始生成TiN0.3化合物，当氮含量为0.1%和0.2%时，在合金中形成了大量的TiN0.3化合物，其主要分布在晶界处；当氮含量增加到0.3%时，在合金的晶界和晶内均有Ti_2N化合物出现。随着氮元素含量的增加，合金的强度与硬度显著提高，伸长率逐渐降低，当氮含量为0.3%时，钛氮合金的抗拉强度达到759 MPa,硬度为408 HV0.2。断口形貌表明，随着氮元素增加，合金的断裂方式由韧性断裂转变为脆性断裂。
Abstract：Ti-xN(x=0, 0.02%, 0.03%, 0.05%, 0.1%, 0.2%, 0.3%, mass fraction) alloys were prepared by arc melting furnace under vacuum atmosphere, and microstructure and mechanical properties of the as-cast alloys were studied by means of optical microscope(OM), X-ray diffractometer(XRD), scanning electron microscopy(SEM) and universal testing machine. The results show that with the increase of nitrogen content, the number of acicular α phase in the alloy increases and the size decreases. When the nitrogen content is less than 0.05%, interstitial solid solution is formed in titanium. When the nitrogen content is 0.05%, TiN0.3 compound begins to form in the alloy; when the nitrogen content is 0.1% and 0.2%, a large amount of TiN0.3 compound is formed in the alloy, which are mainly distributed at the grain boundary; when the nitrogen content increases to 0.3%, Ti_2N compound appears at the grain boundary and in the crystal of the alloy. With the increase of nitrogen content, the strength and hardness of the alloys increase significantly, and the elongation decreases gradually. When the nitrogen content is 0.3%, the tensile strength of the titanium nitrogen alloy reaches 759 MPa and the hardness is 408 HV0.2. The fracture surface morphology shows that the fracture mode of the alloys changes from ductile fracture to brittle fracture with the increase of nitrogen.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2022-0089
中图分类号:TG146.23
引用信息:
[1]李文刚,炊鹏飞,冯甜,等.微量氮元素对纯钛显微组织及力学性能的影响[J],2022,43(09):49-57.DOI:10.13289/j.issn.1009-6264.2022-0089.
基金信息:
国家自然科学基金(51701111);; 陕西省自然科学基础研究计划项目(2018JQ5170);; 陕西省教育厅科研计划项目(19JK0184,21JK0560)