有机碳源替代石墨制备TZM合金及其性能研究

Preparation and Properties of La-TZM Alloy by Substitution of Organic Carbon for Graphite

以有机碳源硬脂酸替代传统的石墨粉末,采用粉末冶金法固-液混合方式掺杂碳元素,后经压制成形、高温烧结、热轧、温轧、冷轧等工艺制备TZM合金板材,并对其力学性能及组织特点进行对比分析。研究结果表明:以有机碳源采用固-液掺杂硬脂酸的TZM合金粉末比传统固-固掺杂石墨粉的TZM合金粉末混合更加均匀,组织中第二相更多、更细小、分布更均匀,第二相质点粒子对位错起到钉扎作用,阻碍晶界滑移,从而显著提高了TZM的抗拉强度,其抗拉强度为1168.23 MPa,伸长率为7.66%,较传统固-固掺杂石墨粉的TZM合金抗拉强度提高了15.3%。

Using the stearic acid as carbon source to replace graphite, TZM alloy was doped with carbon by a solid-liquid mixing method. The TZM sheet was prepared by hot-rolling, warm-rolling, cold rolling and other techniques. The mechanical properties and metallographic structure of the TZM sheet were analyzed. The results show that the TZM alloy powder is mixed more evenly using stearic acid as carbon source than using graphite as carbon source. The second phase is more and smaller. The second phase particles take a pinning effect on the dislocation, binder the slip of the grain boundaries, and thus increase the tensile strength of TZM alloy, which is 1168 MPa and improved by 15.3%, and the elongation is 7.66%.