Metal material low-temperature tensile test device and test method

Abstract

The invention discloses a metal material low-temperature tensile test device. The metal material low-temperature tensile test device comprises a temperature measuring device, a low temperature box, a low-temperature box refrigerating device which is communicated with the low temperature box and tensile test clamps which are connected with a tensile testing machine, wherein the low temperature box comprises a box body, a box internal working space and a box door which is arranged on the box body, and the box body consists of an inner shell, an outer shell and a heat preserving layer which is arranged between the inner shell and the outer shell; the tensile test clamps include an upper clamp and a lower clamp, which are symmetrically arranged on the top and the bottom of the box body, both the upper clamp and the lower clamp respectively stretch into the box internal working space, and the axis of the upper clamp is overlapped with that of the lower clamp; the temperature measuring device with temperature measuring end stretching into the box internal working space is arranged on the middle part of the side wall of the box body; the upper part of the box body is provided with a temperature regulating agent injection opening, a temperature regulating agent discharging pipe which is communicated with the box internal working space and stretches out of the box body is arranged on the bottom of the box body, and the temperature regulating agent discharging pipe outside the box body is provided with a temperature regulating agent discharging pipe valve. The metal material low-temperature tensile test device is simple for controlling the temperature, good in temperature control effect and accurate and effective in test results.

Description

technical field [0001] The invention relates to the technical field of material performance testing, in particular to a low-temperature tensile test device and a test method for metal materials. Background technique [0002] With the development of industrial applications, more and more equipment, such as ships, bridges, and pressure vessels, are applied to low-temperature environments. The metal materials used to make these devices have large differences in their mechanical properties in high-temperature environments and low-temperature environments. Therefore, it is necessary to perform tensile tests on metal materials in low-temperature conditions, that is, low-temperature tensile tests. . Low temperature tensile test refers to applying tensile force to the sample at the specified test temperature until the sample breaks, and then measuring one or several mechanical properties of the sample. The low-temperature tensile test is done in a low-temperature box, which refers...

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Problems solved by technology

However, because the production cost of the gasification net 24 and the internal liquid nitrogen pipe 23 that can be used for liquid nitrogen gasification is relatively high, and the cooling temperature uniformity is greatly affected by the opening and closing state of the gas mist holes on the gasification net 24, the more important The low-temperature tensile test system for threaded steel bars can only realize the temperature uniformity in the chamber 11 of the box, but cannot guarantee the uniformity of the temperature of the tensile sample, which affects the operability of the low-temperature tensile test and the accuracy of the test results. Accuracy and Validity

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