国内外Ti-6Al-4V钛合金铸造技术标准的对比

Differences in Aviation Specifications of Titanium Alloy Castings (Ti-6Al-4V) both at Home and Abroad

通过收集和整理国内外Ti-6Al-4V钛合金铸造技术标准要求,对比分析了标准中参数的区别及其借鉴意义。结果表明,母合金材料来源可借鉴国外标准使用回收料降低成本,化学成分的区别主要集中在Al、H、Si和Y等元素上,国内对力学性能要求相对美国常用标准,抗拉强度高约30MPa、屈服强度髙48～75MPa;国内ASTM E192标准板厚适用的铸件壁厚范围需要与国际标准统一,并推广ASTM E1320钛合金铸件射线检验参考照片作为钛合金内部缺陷的检验标准。

Through an analysis of process requirements in specifications of titanium alloy castings （Ti-6Al-4V） which were selected from both at home and abroad, the differences and references among those specifications were investigated systematically. The vesults show that the domestic master heat can use revert materials as abroad to reduce cost. The differences among chemical components were focused on the elements of Al, H, Si. Especially the foreign specifications of aircraft engineering claimed more severe upper limit for Si and Y elements. After comparing mechanical properties, it is found that the ultimate tensile strength （UTS）, yield strength （YS） of domestic standards are 30 MPa, 48~75 MPa higher than the requirements of Snecma and GE, respectively. The facts suggest domestic specification to reduce the strength requirements. The domestic applicable feature thickness range for ASTM E192 reference plate needed to conform to standards abroad. ASTM E1320 reference radiographs for titanium castings should be popularized to titanium castings as X-ray inspection standards.