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A novel seeding methodology for determining the detectability and effects of inclusions in titanium castings.

机译：一种新颖的播种方法，用于确定钛铸件中夹杂物的可检测性和效果。

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摘要

A novel artificial inclusion seeding methodology was developed to simulate actual titanium investment casting inclusions. Inclusions were added to machined holes in cast titanium plate (Ti-6Al-4V). After being welded closed in a vacuum, hot isostatic pressing (HIP) was utilized to incorporate the inclusions into the cast material.; To validate that this methodology did not result in inherent mechanical property degradation, machined, backfilled, and HIPed holes were produced and compared to virgin, cast Ti-6Al-4V material. Fatigue test results indicated that the drill and HIP methodology did not result in any fundamental mechanical property degradation that would bias comparative results.; Validation that the artificially seeded inclusions were equivalent to “as cast” inclusions was completed. The nondestructive inspection response (to multiple techniques), mechanical fatigue behavior, and metallographic characteristics of the inclusions artificially seeded by the developed methodology were determined to be indecipherable from “as cast” inclusions.; The industry need for supporting data in terms of nondestructive inspection, metallography, and fatigue life was also addressed by this work. The data generated to evaluate the novel seeding methodology was examined with respect to Ti-6Al-4V casting design and inspection needs. The industry methodology for developing radiographic probability of detection data for both ceramic and hard alpha inclusions was determined to be unconservative. The absence of a reaction zone surrounding inclusions placed on varying thicknesses of material prior to radiographic inspection resulted in an overestimation of what is detectable during manufacturing inspections. Metallographic and mechanical data indicate that of the fatigue life effects of the diffusion zone surrounding hard alpha inclusions are minor compared to the effects of the inclusions themselves. Modeling hard alpha inclusions as sharp penny cracks accounting for a “fixed” diffusion related halo appears appropriate. Nondestructive inspection results indicated that immersion ultrasonics is superior at detecting hard alpha inclusions to X-ray radiography. Limited phased array ultrasonic evaluation identified this technique to present an even better detection potential. However, the inspection method should always be determined based upon the geometry of the component to be inspected and the inclusion size that is required to be found.
机译：开发了一种新颖的人工夹杂物接种方法，以模拟实际的钛熔模铸造夹杂物。将夹杂物添加到铸造钛板（Ti-6Al-4V）的机加工孔中。在真空中焊接封闭后，利用热等静压（HIP）将夹杂物掺入铸造材料中。为了验证该方法不会导致固有的机械性能下降，我们制造了机加工，回填和HIP孔，并与纯铸Ti-6Al-4V材料进行了比较。疲劳测试结果表明，钻头和HIP方法不会导致任何基本的机械性能下降，而这会使比较结果产生偏差。人工种子夹杂物等同于“铸造”夹杂物的验证已完成。通过开发的方法人工植入的夹杂物的无损检查响应（对多种技术），机械疲劳行为和金相学特征被确定为“铸态”夹杂物无法识别。这项工作还满足了行业对无损检测，金相学和疲劳寿命方面支持数据的需求。针对Ti-6Al-4V铸件设计和检查需求，检查了用于评估新型播种方法的数据。确定用于开发陶瓷和硬质α夹杂物的射线照相概率检测数据的行业方法被认为是不保守的。在射线照相检查之前，围绕放置在不同厚度的材料上的夹杂物周围没有反应区会导致对制造检查期间可检测到的东西的高估。金相和力学数据表明，与硬质夹杂物相比，硬α夹杂物对扩散区的疲劳寿命影响较小。将硬质α夹杂物建模为尖锐的便士裂纹，说明“固定的”扩散相关光晕似乎是合适的。无损检查结果表明，浸入式超声波在检测硬质α夹杂物方面优于X射线照相。有限的相控阵超声评估确定该技术可提供更好的检测潜力。但是，应始终根据要检查的组件的几何形状和需要找到的夹杂物大小来确定检查方法。

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  • 作者

    Ret, Paul Louis.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Materials Science.; Engineering Metallurgy.; Engineering Industrial.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 323 p.
  • 总页数 323
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;冶金工业;一般工业技术;
  • 关键词

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