Oxygen, Nitrogen, and Hydrogen in Refractory Metals
Summary
One of the most critical chemical specifications of titanium alloys is the hydrogen content. Too high of a
hydrogen content can cause hydrides to precipitate, which can lead to embrittlement and subsequent
cracking when the alloy is stressed. Hydrogen pickup typically occurs during downstream processing steps
such as heat treating, pickling, and cleaning.
The LECO ONH836 is a simultaneous oxygen, nitrogen, and hydrogen determinator that utilizes an electrode furnace, inert carrier gas, and both infrared and thermal conductivity detection to meet the analytical needs of the refractory metal industry.
This application note was written specifically for use with the LECO ONH836 series determinator.
Procedure – Powder/Chip Samples
Instrument calibration/drift correction.
Press the Analyze button on the instrument screen. After a short delay, the loading head slide-block will open.
Place the Nickel Capsule containing the sample into the open port at the top of the loading head.
Press the Analyze button on the instrument screen again, the loading head slide-block will close and the lower electrode will open.
Clean the upper and lower electrode either manually or remove the crucible and press the analyze button to clean with an automatic cleaner if applicable.
Summary
The determination of the amount of oxygen, nitrogen, and hydrogen in iron, steel, nickel-, and cobalt-base alloys represents some of the most important quality metrics for these materials. Oxygen is used to create steel from pig iron by removing excess carbon. Oxygen content must be controlled to limit the amount of carbon monoxide that can be formed during solidification which may cause excessive porosity. Nitrogen is considered both an impurity as well as an important alloying agent. Itcan be present as a nitride or interstitially in its gaseous form. Increased nitrogen content is known to increase yield and tensile strength, thus decreasing ductility and formability. Excessive levels may evolve during solidification thus increasing porosity. High hydrogen content is the primary cause of embrittlement, blistering and flaking due to its high
mobility through the lattice and provides no potential alloying benefits. The ONH836 utilizes a high-power
electrode furnace to quickly and efficiently release the target gases from within the sample, which allows
for a very rapid simultaneous determination of oxygen, nitrogen, and hydrogen.
Procedure - Solid Samples：
--Instrument calibration/drift correction.
Place the nickel basket containing the calibration/drift standard into the open port at the top of the loading head.
Press the Analyze button on the instrument screen again, the loading head slide-block will close and the lower electrode will open.
Clean the upper and lower electrode manually, or, if applicable, remove the crucible and press the analyze button to clean with the automatic cleaner.
Instrument calibration/drift correction
f. Clean the upper and lower electrode manually, or, if applicable, remove the crucible and press the analyze button to clean with the automatic cleaner.
g. Firmly place a graphite crucible on the lower electrode tip.
h. Press the Analyze button on the instrument screen, the lower electrode will close and the analysis sequence will start and end automatically.
i. Repeat steps 3b through 3h a minimum of three times for each calibration/drift standard used.
. Calibrate/drift following the procedure outlined in the operator's instruction manual.
Cornerstone氢氧氮分析软件同时支持***的书记文档格式和可变的报告格式。北京氧氮氢分析仪厂家直销
736 Series: Oxygen/Nitrogen by Inert Gas Fusion
The 736 family of Elemental Analyzers is designed for routine measurement of oxygen and nitrogen content of
inorganic materials, ferrous and nonferrous alloys, andrefractory materials using the inert gas fusion technique.
These instruments feature our Cornerstone brand ® software, a custom interface designed specifically for
touch-screen operation. Developed by combining longterm research with customer feedback, this easy-to-use
software gives you complete access to instrument control, analysis settings, diagnostics, reporting, and more—without sacrificing valuable bench space.
北京氧氮氢分析仪厂家直销
