Method for reducing hysteresis error of precipitated martensitic stainless steel

Abstract

The invention relates to a method for reducing the hysteresis error of out-precipitated martensitic stainless steel elastomer. The method comprises the following: a step of performing solid solution, which is to heat a bar with a furnace at a speed between 5 and 30 DEG C per minute, heat the bar to 1,040+ / -10 DEG C, preserve heat for 1 to 4 hours and compulsively cool the bar to room temperature; a step of deep cooling, which is to cool the compulsively cooled bar in liquid nitrogen at a cooling temperature between 70 and 90 DEG C below zero for 2.5 to 6 hours; a step of performing deformation processing, which is to stretch or compress the deep cooled bar at a speed less than or equal to 5 millimeters per second at normal temperature and control the elongation or compression ratio of the bar in the stretching / compressing direction between 1.0 and 5.0 percent; a step of aging, which is to put the deformed bar into a heating furnace at a temperature not higher than 200 DEG C, heat the bar with the furnace at a speed between 5 and 30 DEG C per minute, raise the temperature to 480+ / -5 DEG C and preserve the heat for 2.5 to 5 hours. The method improves the capability of out-precipitated martensitic stainless steel in resisting micro-region plastic deformation, and reduces the hysteresis error of weighting sensors.

Description

technical field

[0001] The invention relates to a method for reducing hysteresis errors of precipitated martensitic stainless steel elastic bodies, and belongs to the technical field of manufacturing elastic bodies of weighing sensors. Background technique

[0002] The resistance strain type load cell is composed of an elastic body, a strain gauge and a detection circuit. The strain gauge is adhered to the elastic body. When the elastic body is loaded by an external force, the elastic body and the strain gauge wire grid are elastically deformed synchronously, and the strain gauge The change of the resistance value of the wire grid, through the detection circuit, realizes the conversion between the loading stress and the electrical signal, and realizes weighing. Hysteresis means that the sensor is loaded step by step from no load to the rated load, and then unloaded step by step from the rated load. At the same load, the sensor unloading and loading output difference, see fi...

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