SU1224615A1 - Method of temperature metering - Google Patents

Abstract

The invention can be used in the control of thermal conditions in the manufacture and operation of machine parts and devices. The aim of the invention is to improve the accuracy and expand the range of temperature measurement. Disks of hardened martensite aging steel are mounted on the surface of the part. After coating on the disks, their hardness and volume fraction of austenite are determined by the X-ray structural method. The temperature of the part is determined from the curves of sample hardness and the ratio of austenite and martensite to temperature. 1 pe.

Description

The invention relates to mechanical engineering technology, namely to the control of thermal conditions in the manufacture and operation of machine parts and devices.

The purpose of the invention is to increase the accuracy and expand the range of temperature measurement.

. The drawing shows the correlated dependences of the hardness and relative removable fraction of austenite and heating temperature of martensitic-aging steel of type H18K9M5T with an exposure of 1 h (curves I and and), as well as vitality of hardness of high carbon steel U10A in the same temperature range (curve II ).

The volume fraction of austenite is determined by one of the known methods, for example, an X-ray structural method based on the ratio of the integral intensities of reflections from the (111) austenite and (110) martensite planes (6). Hardness is determined by Vickers.

To determine the process temperature, a previously plotted hardness and volume fraction of austenite versus processing temperature is measured through a point on the axis. The coordinates corresponding to the hardness and / or volume fraction of austenite measured on the sample are drawn straight parallel to the abscissa axis. This straight line, in general, intersects both curves — hardness (I) and volume fraction of austenite (I) at four points. In the absence of austenite, the temperature is determined by the intersection point of the straight line with the left branch of curve 1 (point T). With austenite and sample density of at least 400 kg / mm, the temperature is determined by the intersection point of the straight with the right branch of the hardness curve (T).

With a hardness below 400 kg / mm, the temperature is determined by the right branch of the austenite curve (curve P, point T).

Example. The heating temperature of the metal part was measured during the coating of the titanium nitride hard coating by the CIB method (ion bombardment condensation).

The presence of an electrostatic floor of high voltage and the need for complex movement of parts in the chamber.

where the coating is applied, eliminated the possibility of using thermoelectric and thermo-resistive pyrometers, and the presence of a luminous plasma did not allow the efficient use of photopyrometers. The need to control the heating temperature during the coating process is determined by the fact that it is

determines the values of the stresses at the boundary of the layer - substrate, arising due to the difference in the coefficients of linear expansion, and, consequently, the efficiency of the applied

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To measure the temperature on the surface of the part, disks with a thickness of 0.6–1 mm of hardened martensite aging steel (MCC) of the type were fixed.

H18K9M5T (the proposed method), as well as from hardened carbon steel (CST) U10A (a known method).

After the process, the coatings on the MCC disks were determined by Vickers hardness and the volume fraction of austenite by the X-ray diffraction method (6), and the Vickers hardness was determined on the disks from the US.

According to graphs 1 and I, the temperature of the processes was determined from samples from the MLS, and according to schedule III - from samples from the DC. The scatter of hardness in all cases was 110 kg / mm,

and the scatter of austenite volume fraction values is ± 5%.

Claims (1)

Invention Formula The method of measuring the temperature, which consists in placing the sample on the part before the temperature effect and measuring its hardness after the temperature effect, characterized in that, in order to expand the range of controlled temperatures and increase accuracy, martensitic-aging steel is used as a sample, and the austenite-to-martensite ratio after temperature is additionally determined, and the part temperature is determined from previously constructed curves of known dependences of sample hardness and the ratio in it austenite and martensite on temperature. Editor N.Kishtulinets Compiled by N. Svetushkov Tehred I.Popovich Proofreader S.Cherni Order 1941/39 Circulation 778 Subscription VNIIPI USSR State Committee on inventions and discoveries 113035, Moscow, Zh-45, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4