Thursday, October 17, 2019

Compelling reasons normalizing produces high quality gears

In this day and age, adding steps to the gear manufacturing process is not highly desirable unless the benefits far outweigh the costs incurred....

Residual stress evaluation in bearings

Lingering stress is not easily identified during production, but has a direct impact on wear performance and fatigue life

Hardness scale conversion

The use of hardness testing as a quality control method to check the outcome of a thermal treatment process is a common application of...

Creep deformation mechanisms in 9CrMo steel

The Generation-IV reactors in nuclear power plants are expected to address the growing energy demand by producing electricity and, at the same time, mitigating...

Variation in Hardenability

Many heat-treating processes cannot tolerate appreciable variations in steel hardenability. For an established in-control process, deviations in chemical composition and starting microstructure may result...

Enhanced properties of metal matrix nanocomposites

Application of carbon nanotube (CNT) reinforced metal matrix nanocomposite (MMNC) has been increasing rapidly since the discovery of CNT in the 1990s. These novel...

Achieving results through cold treatment

Cold treatment is a sub-zero thermal treatment process primarily used to reduce the retained austenite content of alloy and high carbon steels. Cold treatment...

Materials Selection for Induction Hardening Processes

Induction hardening is the most common technique of the various types of applied energy processing. It uses alternating current that induces a magnetic field...

Determining Austenite Grain Size

Grain size is a critical metallurgical characteristic, significantly influencing design parameters such as strength and toughness. Austenite grain size (often referenced to as prior-austenite...

Heat-treatment of modified 9CrMo steel

The modified 9CrMo steels, such as Grade 91, Grade 92, and HT9, are materials of choice for fossil-fuel-fired power plants and Next Generation Nuclear...

Coupling Alloy and Process Selection

Combining both alloying and processing into a single strategy to achieve a desired level of performance sounds like a simple concept, but can be...

Hardening and tempering in the same cell

Tempering hardened steels is one of the most important heat treating processes used in part manufacturing. Induction tempering produces hardness and mechanical properties similar...

Testing of Induction Hardened Work Pieces

Hardness testing is a simple and universally accepted practice for checking induction hardened parts and is performed in literally thousands of manufacturing facilities. There...

Different Scales Are Used For Rockwell Hardness Testing

Production Bench Rockwell Hardness Testing of Small Work Pieces As induction hardened workpieces get smaller in size, attention to the proper abrasive cutting of the...

Induction Hardening Choices for Gears

Of the various types of applied energy processing, induction hardening is the most common. Induction heating is a process that uses an alternating electrical...

Case Depth Determination

Methodology to ensure design intent is satisfied

How to keep decarburization in check

The performance of heat-treated steel components is largely dependent on the condition of their surface. Wear and fatigue resistance are examples of design criteria...

Non-Martensitic Transformation Products (NMTP)

Whether formed during a conventional quench and tempering process, carburizing, or induction hardening, non-martensitic transformation products (NMTP) are widely considered undesirable microstructural features. However,...

Aluminum heat-treating has unique challenges

From a metallurgical and quality perspective, aluminum heat-treating presents unique challenges when compared to carbon-based steels. This article will examine the aspects of aluminum...

Carbon potential verification

Choose from several verification methods for best fit, then develop a plan to correct for out-of-spec test results

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