Effect of Boron and Yttrium Slight Addition on Grain Refinement and Mechanical Properties of Ti-13Cr-1Fe-3Al Alloys
Beta Ti-13Cr-1Fe-3Al is a low-cost,high-strength alloy. Grain coarsening occurs in this alloy during heat treatment. Grain refinement by the addition of boron or yttrium to titanium alloys has been previously reported. In this study,the effects of slight boron and yttrium addition on the microstructure and mechanical properties of Ti-13Cr1Fe-3Al alloys were investigated. Beta grain growth was controlled by pinning at the TiB and Y2O3 precipitates. In the OB to 0. 3B alloys,equiaxed grains were obtained. Equiaxed grains were also obtained in the 0Y and 0. 05Y alloys. However,in the 0. 1Y and 0. 3Y alloys,elongated grains along the rolling direction were observed in addition to the equiaxed grains. The average beta grain size decreased with increasing boron content. By the addition of 0. 05％ yttrium, the grain size decreased drastically. However,further addition of yttrium did not change the grain size. The tensile strengths of the boron- or yttrium-added alloys were almost the same as those of the alloys without B or Y addition. Elongation in the B-added alloys decreased monotonically with increasing B content in the 0B to 0. 3B alloys. Elongation of the Y-added alloys was almost the same as that of the alloys without Y addition.
Beta titanium alloys grain refinement boron yttrium
Aya TOMITA Masato UEDA Masahiko IKEDA
Graduate student of Kansai University,Suita 564-8680,Japan Faculty of Chemistry,Materials and Bioengineering,Kansai University,Suita 564-8680,Japan
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
544-546
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）