Stress sensor fabricated from a material having precipitated granular carbides
US5652394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1995 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Nov 30, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A stress sensor, which, in use, is attached to a measuring object and generates Barkhausen signals, for measuring a stress applied to the object, wherein the Barkhausen signals have a reduced temperature dependence. The stress sensor is characterized by comprising a steel material having such a texture that a granular carbide comprising: element M wherein M represents at least one element selected from Fe, Al, B, Co, Cr, Mn, Mo, Nb, Ni, Si, Sn, Ti, U, V, W, and Zr; and C has been precipitated in the interior of ferrite grains. Preferably, the average grain diameter of the granular carbide precipitated in the texture is 0.05 to 1.0 .mu.m, and the standard deviation in grain size distribution of the granular carbide is 0.14 to 2.0 .mu.m. In another preferred embodiment, the average grain diameter of the granular carbide is more than 1.0 .mu.m and 3.0 .mu.m or less. Still preferably, the carbide is an M.sub.3 C compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.