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Low-Pressure Vacuum Carburizing.by Frederick Otto (Midwest Thermal-Vac) and Daniel H. Herring (The Herring Group Inc.) Low-pressure vacuum carburizing, is a technology developed in the mid 1990's, has helped revolutionize the heat treating industry, primarily because of its capability for precise process control. Tight control enables absolute repeatability, optimized part microstructure, enhanced mechanical properties, and reduced manufacturing costs. 
Advancements in precision Carburizing of new Aerospace and Motorsports materials. by Frederick Otto (Midwest Thermal-Vac) and Daniel H. Herring (The Herring Group Inc.) Demand for vacuum carburizing systems equipped with high pressure gas quenching, oil quenching, or both has quadrupled since 2000. Commercial heat treating has seen the second largest increase in the number of installed low pressure vacuum carburizing units. Click to read the full article. 
Vacuum carburizing of aerospace and automotive materials.
by Frederick Otto (Midwest Thermal-Vac) and Daniel H. Herring (The Herring Group Inc.) Only low pressure vacuum carburizing allows the end user to dial in settings for case depth, carbon profiles, surface/core hardness, and case/core microstructure, and predict distortion results to achieve required properties at the lowest unit cost. Click to read the full article. 
Improvements in Dimensional Control of Heat Treated Gears
by Frederick Otto (Midwest Thermal-Vac) and Daniel H. Herring (The Herring Group Inc.) The goals and objectives of this investigation focused on highly distortion-prone gearing to determine if dimensional improvements could be realized by applying low pressure vacuum carburizing technology utilizing either oil or high pressure gas quenching. Click to read the full article. 
Gear Heat Treatment. Part 1
by Frederick Otto (Midwest Thermal-Vac) and Daniel H. Herring (The Herring Group Inc.) Gears play an essential role in performance of many products that we rely on in our everyday life. When we think about gears, We generaly separate them in two categories: motion-carrying and power transmition. The focus here is on heat treating gears intended for heavy duty service. Click to read the full article. 
Gear Heat Treatment. Part 2
by Frederick Otto (Midwest Thermal-Vac) and Daniel H. Herring (The Herring Group Inc.) Today, atmosphere carburizing of gears is de facto standard by which all other hardening techniques, including induction, are measured. The process will continue to be a dominant technology well into future due in part to its proven results, wide acceptance and energy choice. Click to read the full article.
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