Plasma nitrocarburised at deg C for 30 hrs. Simply determining the depth to the minimum specified surface hardness and total case depth should adequately define the hardness profile of the majority of induction hardened components.
Approximately 66 percent to 75 percent of the total case depth , but often specified as the depth to a specific hardness. The term case depth refers to the depth of the case, or hardened layer of a piece of material.
The beginning of the case-core transition region.
However, a paper by Fett  concluded that the torsional strength of induction hardened medium-carbon steel shafts more closely correlates with Case depth determination case depth, while the fatigue performance more closely correlates to total case depth.
At Zion Industries we work with our customers to make sure that we understand their requirements, and when necessary can help clarify the requirements that may be on a third party print. The case hardness will allow the piece to have superior wear and strength characteristics at the surface, but allow the interior of the piece to remain flexible.
The term total case depth refers to the depth of hardness where the hardened layer reaches the same hardness and properties as the base or core material. A micrograph indicating plasma nitrided layer is shown in Fig. It is important to understand that the measurement method called for on the print was established at the engineering stage, and the design intent must be followed as the method of measurement is determined.
Case depth measurement From the sample, cut a test piece perpendicular to the surface and mount it. This observation makes sense after further examination of the profile shown in Figure 1.
The total case depth of an induction hardened component is the location in the core that has the lowest strength and highest stress, assuming the stress is highest toward the surface — an assumption that is valid in nearly all loading schemes.
No Comment One of the benefits of induction hardening is the ability to selectively apply a surface hardness or case hardness to steel materials. For example, high carbon steel that may have a minimum surface hardness of 60 HRc may call for an effective case depth of 0.
Case depth is of particular interest to the product designer because it characterizes the gradient in material properties near the surface, where stresses tend to be the highest. Measuring Case Depth Accurately measuring the surface hardened case depth of a component is not a task that should be trivialized.
ECD can be up to 0. All three techniques require careful sample preparation and sound hardness testing methodology to ensure data validity.i ABSTRACT MURAT DEVECI: Nondestructive Determination of Case Depth by Barkhausen Noise Method Tampere University of Technology Master of Science Thesis, 60 pages, 0 Appendix pages May Master’s Degree Programme in Materials Engineering.
View Lab Report - Memo Determination of Case Depth from MECE at University of Texas Rio Grande Valley. (kg/m^2) Rockwell (HRD) Diamond Pyramid %(1). ISO (en) × ISO (en) HV) from the surface, a limiting hardness value greater than HV, in steps of 25 units, can be selected for the determination of the case hardening depth by agreement between interested parties.
Effective case depth is an important factor and goal in gas carburizing, involving complicated procedures in the furnace and requiring precise control of many thermal parameters. Based upon diffusion theory and years of carburizing experience, this paper calculates the effective case depth governed by carburizing temperature, time, carbon content of steel, and carbon potential of atmosphere.
ISO Steel -- Determination and verification of the effective depth of carburized and hardened cases. Defines the effective case depth, and specifies methods for the determination of this depth, in steel. Is applicable to carburized cases and carbo-nitrided cases, the depth of which is greater than 0,3 mm, and parts which have a.
NDT&E International 40 () – Case depth determination in heat-treated industrial steel products using photothermal radiometric interferometric phase minima.Download