Search Results for temperature control

A quench tank must contain sufficient fluid to quench the load without an excessive rise in temperature of the quenching fluid. This brief article describes the basics of sizing quench tanks for immersion quenching and offers a methodology for sizing the temperature-control system.

A temperature management system is essential to accurately monitor and control the heat treating process for maximum productivity and product quality.

Successful part brazing relies on proper joint design, part cleanliness, and correct fixturing of part assemblies. Routine furnace maintenance allows repeatable, quality brazing results over time. This article describes aluminum brazing processes and process control considerations.

Vacuum heat treating is a crucial step in the additive manufacturing process cycle to meet required part quality specifications.

Accurate and continuous dew point measurement is key to maintaining the atmosphere required to achieve high quality and consistency of sintered products in powder metallurgy processing.

Three types of thermal treating processes are commonly applied to magnesium alloys, including annealing, solution heat treatment, and precipitation, or aging.

A new method to control distortion in difficult-to-quench geometries addresses the nonuniform cooling inherent in most gas quenching processes. This article describes the development of a controlled gas quenching prototype unit design and its operation. The prototype unit constructed was able to achieve great control within the temperature range of 400 to 100°C, using varying rates of temperature change.

The corrosion of structural materials and control of coolant chemistry are key factors that impact the lifetime of nuclear reactors and the development of future reactors. This article reviews corrosion issues in four reactor concepts that use vastly different coolant types: light water reactors, lead fast reactors, high temperature gas-cooled reactors, and fluoride salt-cooled high temperature reactors.

Martempering involves cooling steel from the austenitizing temperature and rapidly cooling into either specially formulated petroleum oil or a molten salt bath with a specific composition to a temperature slightly above the martensite start (Ms) transformation temperature of the steel. Martempering is performed to reduce distortion problems that may be encountered with conventional quenching methods. This article, adapted from the latest ASM Handbook on quenching and quenchants, describes suitable steels for martempering and variables that influence the process.

Production techniques based on net shape forming from the liquid or semisolid state offer advantages in terms of manufacturing simplicity, cost, and energy consumption compared with current complex solid state forming processes. Engineering molten alloys to change their solidification process improves part integrity and alloy microstructure, leading to better component performance.

Stringent pressure control and gas species type both play an important role in minimizing the evaporation rate of not only copper, but other elements susceptible to evaporation in vacuum systems. The article describes a study investigating the effect of temperature, pressure, and carrier gas species on the amount of copper evaporation that occurs from copper foil test samples in low pressure carburizing.

As a regular contributor to the HTPro eNewsletter, Professor Induction answers a wide variety of questions regarding induction heating and heat treating. This column addresses control of quenching temperatures and affect on induction hardening results.

Increasing and controlling particle impact temperature is proving to be beneficial for both process performance and coating properties.

Corrosion is commonly defined as the deterioration of a material or its properties because of a reaction with its environment. It is a natural process due to a high energy state induced in metals and alloys during refining, processing, and manufacturing. Modern methods for preventing and controlling corrosion can reduce or eliminate its impact on public safety, the economy, and the environment. New technologies push materials to withstand increasingly demanding conditions as a result of higher temperatures and pressures, and environments with greater corrosivity. Therefore, the risks of new types of corrosion failures need to be considered along with methods to avoid them, as described in this article.

There is growing interest in steels microalloyed with titanium, niobium, and molybdenum for use in high-temperature carburizing applications. This article describes methods for control of grain coarsening and work to commercialize microalloyed coarsening-resistant steels.

An in-situ annealing technique combined with electron backscatter diffraction was used to characterize the microstructural evolution of ZE20 magnesium alloy as a function of temperature. This work sets the stage for future experiments to understand and control the recrystallization behavior of commercial alloys.

This article explains how coating technology originally developed for use in nuclear power generating equipment is helping automotive engineers solve heat, wear, and performance challenges using new materials and design approaches.

Shape memory alloy textiles provide complex deformation and force profiles for novel wearable applications.

Consumer demand for greater fuel efficiency and a changing regulatory environment have stimulated substantial interest in alternative materials for passenger vehicles. Automotive manufacturers now have a wide variety of choices available, ranging from various grades of steel and aluminum to the most advanced lightweight composite materials. This article describes testing innovations introduced to keep pace with the use of new materials in automobiles.

Early consideration of scale-up requirements can help circumvent downstream problems when implementing thermal processes for the production of new materials and product forms. Examples are given showing how success is achieved when scaling opportunities and challenges are identified early in the development process.