Microstructural improvements of titanium alloys
A microstructural, titanium alloy technology that is used in the areas of process efficiency improvement, additive manufacturing, additive processing, etc. to address issues affecting the ability or efficiency of additive manufacturing operations, declining material valuations, and inefficiencies in manufacturing
Inactive Publication Date: 2021-12-31
普拉西斯粉末技术股份有限公司
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Problems solved by technology
This can also cause the material's valuation to drop, limiting performance to the "weakest" direction
Differences in microstructure can also lead to manufacturing inefficiencies by dictating how the product must be oriented during the build process, which can affect the capability or efficiency of the additive manufacturing operation
Method used
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[0123] Preferred examples of microstructural modification of titanium alloys according to the invention are described below. In describing the embodiments shown in the drawings, specific terminology will be used for the sake of clarity. However, the invention is not limited to the specific terms so selected and it is to be understood that each specific term includes all technical equivalents which operate in a similar manner to accomplish a similar purpose. Similar elements are described in several embodiments, and for ease of understanding, the same reference numerals are used in several embodiments.
[0124] The term "selective melting" has been or will be used throughout this disclosure. For the sake of clarity, it should be understood that use of the term "selective melting" is intended to include all additive manufacturing techniques that incorporate a melting event. The term "additively manufactured" should be interpreted more broadly to include all additively manufact...
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Abstract
A method of modifying the physical characteristics of a base titanium alloy article previously manufactured through a selective melting process is disclosed. The method includes introducing hydrogen through a thermohydrogen process to the base titanium alloy article, the resulting titanium alloy article exhibiting an isotropic and fine grained equiaxed microstructure. The thermohydrogen process may include introducing hydrogen into the base titanium alloy article to lower the beta transus temperature, heating the base titanium article above the lowered beta transus temperature to form hydrided beta, lowering the temperature of the base titanium alloy article to affect a eutectoid transformation, and dehydriding the base titanium alloy article via vacuum heating. The base titanium alloy article may have an elevated oxygen content and / or hydrogen may be introduced at 0.4 weight percent or greater.
Description
[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application Serial No. 62 / 819,565, filed March 16, 2019, entitled "MICROSTRUCTURALHOMOGENIZATION OF ADDITIVELY MANUFACTURED TITANIUM ARTICLE S," the disclosure of which is hereby incorporated by reference. technical field [0003] This disclosure relates to techniques for modifying the titanium microstructure of titanium articles. While these techniques can be used to improve titanium articles manufactured by a variety of techniques, the present disclosure is particularly concerned with the homogenization of additively manufactured titanium articles. This includes homogenization to improve performance characteristics. Background technique [0004] As we all know, titanium additive manufacturing itself is a layer-by-layer manufacturing process, which is reflected in the macro- and micro-structure of the products manufactured by this method. In fact, the or...
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IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183C22F1/02Y02P10/25B33Y40/20C22C1/0458B22F2999/00B22F10/64B33Y70/00B33Y80/00B22F10/28B22F10/25C22C2200/00B22F3/15B22F2201/013B22F2301/205B22F2998/10
Inventor P·H·谢菲尔德J·A·小格罗霍斯基
Owner 普拉西斯粉末技术股份有限公司