Method of treating a workpiece comprising a titanium metal and object

A processing method and technology of titanium metal, applied in metal material coating process, superimposed layer plating, coating and other directions, can solve the problems of weak support and long cost of hard and brittle nitride layer, eliminate residual stress, improve Mechanical properties, the effect of eliminating internal porosity

Active Publication Date: 2019-01-04
SENTINABAY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main limitations of these treatments are long and costly processes, resulting in thin nitride layers and shallow penetration of nitrogen into the bulk metal, resulting in only weak support for hard and brittle nitride layers

Method used

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  • Method of treating a workpiece comprising a titanium metal and object
  • Method of treating a workpiece comprising a titanium metal and object

Examples

Experimental program
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Effect test

Embodiment

[0069] A workpiece comprising commercially pure titanium (grade 2) in the form of a thin-walled tube (t = 1.0 mm) was placed in figure 2 in a hot isostatic press of the type shown. Nitrogen N 2 into the chamber of the press 10.

[0070] During step a), the gas temperature was increased until the workpiece temperature reached 960°C. At the same time, the gas pressure increased to 170MPa.

[0071] In step b), the same temperature and gas pressure were maintained for 2 hours.

[0072] Since this temperature is already above the "beta transus" temperature, the titanium alloy does not require an increase in temperature in step b).

[0073] In step c), the workpiece is quenched by cooling nitrogen gas according to the following gas cooling rate:

[0074] Between 960 and 900°C, 3600K / min,

[0075] Between 900 and 800°C, 2460K / min,

[0076] Between 800 and 700°C, 1440K / min,

[0077] Between 700 and 600°C, 1020K / min, and

[0078] Between 600 and 500°C, 600K / min,

[0079] The...

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Abstract

Method of treating a workpiece (12) comprising a titanium metal, wherein a titanium metal surface layer of the workpiece is converted to titanium nitrides. The method comprises the following steps: a)heating the workpiece (12) to an initial nitriding temperature (Tn1) and b) subjecting said workpiece to one or more nitriding temperatures (Tn1, Tn2) for predetermined time(s) in a nitrogen containing gas (14) under high pressure at hot isostatic pressing (HIP) conditions for converting the titanium metal surface layer to a first layer portion consisting of titanium nitrides and a second layer portion comprising a nitrogen gradient in the titanium metal. The method further comprises c) quenching the workpiece (12) in the nitrogen containing gas (14) under high pressure at hot isostatic pressing (HIP) conditions, in order to strengthen the titanium metal below the in step b) formed first nitride layer portion.

Description

technical field [0001] The present invention generally relates to methods of processing workpieces comprising titanium metal. More specifically, the present invention relates to a method comprising nitriding at least a portion of a workpiece such that a surface layer of a titanium alloy is converted to titanium nitride. The invention also relates to articles subjected to this method. Background technique [0002] Titanium has been increasingly used in various technical fields, such as in the automotive, aerospace, mining, medical and other industries for the manufacture of machine parts and other components. In fact, chemically pure titanium is not used in industry, but titanium is alloyed to form various alloys with different properties. Examples of some commonly used titanium alloys are so-called commercially pure (cp) titanium or titanium grade 2 (sometimes called unalloyed), titanium grade 5 (Ti-6Al-4V) and titanium grade 9 (Ti-3Al-2.5V ). In the following descriptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/14C22F1/18
CPCC22C21/14C22F1/183C23C8/24C22F1/002C22F1/02C23C28/042C23C28/048
Inventor P·尼曼E·约翰逊R·拉克
Owner SENTINABAY AB
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