On the critical quenching rate

Karpov, L. P.

doi:10.1007/bf00713413

Met Sci Heat Treat

1992

DOI: 10.1007/bf00713413

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On the critical quenching rate

L. P. Karpov¹

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1998

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“…Specimens with a size of ~ 6 x 16 nun from steel 20Kh were used for determining the critical hardening rate of the diffusion layer by measuring the hardness HV of the end face after quenching from 800~ in various media with a known rate [5,6]. The critical cooling rate vcr = 150 K/sec, which should be taken into account when choosing the quenching regime for the parts after cyaniding.…”

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Cyaniding steels with the use of triethanolamine

Karpov¹

1998

Met Sci Heat Treat

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Cyaniding is widely used in basic engineering for surface strengthening of parts. Triethanolamine is often used as the liquid matter in the process. However, cyaniding is often conducted by adding ammonia into the liquid matter, which creates problems with the utilization of the remainder of the gas. The addition of other gases (nitrogen, argon, etc.) into ammonia is not appropriate because the latter does not decompose completely. The present paper is devoted to the results of industrial tests of a cyaniding technology at 800~ with the use of triethanolamine without ammonia or any other gas or substance.It has been shown in [1] that cyaniding can be conducted by introducing from i to 50% ammonia into the working medium. The process of low-temperature cyaniding in an atmosphere of triethanolamine is considered in [2], but the hardness of the diffusion layer obtained by this method without subsequent quenching is unsatisfactory. The authors of [3] suggest that cyaniding should be conducted at 700~ by adding ammonia into the gas mixture. The use of triethanolamine without additives as the saturating medium is considered in [1] for high-temperature cyaniding (at 880~ and higher) with reference to the works of S. M. Gugel'. The fabrication of a quite hard surface layer in saturating steels in triethanolamine is described in [4], but here the gas mixture is prepared by adding monoethanolamine and bottoms of the regeneration of ethyl alcohol.The use of high-temperature cyaniding creates additional problems, namely, the oxidation of the heaters and the checkerwork of the furnace, which makes it necessary to replace them quite often, the grain growth in the structure of the steel and the necessity for subsequent normalizing or preliminary quenching, and a considerable technological allowance before the cyaniding in order to eliminate the possible deformation of the parts and to remove the burn-on by subsequent grinding.The aim of the present work consisted in the development of a method for cyaniding steel parts at a diminished temperature with the use of triethanolamine without adding any other gas.We studied sliders from steel 38Kh2MYuA, for gates of the fountain equipment of the petroleum industry and specimens from steels 20, 20Kh, and 18KhG ( had the form of plates with openings. The liquid matter was triethanolamine supplied in accordance with the TU 6-09-2448-91 Specifications. The cyaniding was conducted in shaft furnaces of the SShTsM-6.6/914 type with a functional space ~3 600 x 600 and • 650 x 850 mm in size and a Ts-105 furnace (~3 600 • 1200 mm) in accordance with an instruction for the operation of furnaces with an open torch. The flow rate of triethanolamine for heating the charge was 30-40 drops/min; in the diffusion saturation in the heat treatment process the flow rate was 60 -80 drops/min; the feeding was stopped at a temperature of at least 750-730~ (in some cases at 650~Triethanolamine was fed directly into the furnace.In order to estimate the quality of the sliders we used a procedure that envisaged...

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“…The critical rate of hardening of the middle of a part and of the diffusion layer was determined by the method developed by the author in [5,6]. The content of nitrogen in the diffusion layer was determined qualitatively 2 using an x-ray Superprobe-733 microanalyzer.…”

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confidence: 99%

Cyaniding steels with the use of triethanolamine

Karpov¹

1998

Met Sci Heat Treat

Self Cite

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show abstract

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On the critical quenching rate

Cited by 1 publication

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Cyaniding steels with the use of triethanolamine

Cyaniding steels with the use of triethanolamine

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