Influence of the quenching temperature on the phase composition, structure, and wear resistance of 150XHM steel

Abstract

The prevention of abrasive wear is of great impor tance, since such wear can cause premature failure of components in mining, metallurgical, construction, and drilling equipment. We are particularly interested in the cylindrical bushes of borehole pumps, which are subject to cyclic loads at high variable pressure, as well as the abrasive action of borehole fluid with suspended solid particles. The complex loading results in rapid bush failure, on account of hydroabrasive wear and the appearance of impermissible gaps in the bush-piston assembly.In the present work, in connection with the devel opment of a production process for cylindrical 150XHM steel bushes of borehole pumps, we study the influence of the quenching temperature (in the range 850-1175°C) on the wear resistance, in combination with the structural strength of the bushes. The bushes are held at the specified temperature for 30 min, with subsequent cooling in oil.We study the microstructure and abrasive wear resistance on 10 × 10 × 25 mm samples taken from cast 150XHM steel pipe blanks after normalization and tempering. 1The wear resistance of the 150XHM steel sam ples is estimated on special equipment based on a planing machine. Samples with a 10 × 10 mm work ing area perform reciprocating motion over corun dum based 14A32MN481 abrasive paper (State Standard GOST 6456-82). The length of a single working pass is 0.135 m; the frictional path in a single 1 V.V. Yurovskikh (OAO Uralmashzavod) took part in these proce dures.test at 0.158 m/s is 120 m. The normal load on the sample is 10 kg (unit load 1 MPa). The transverse dis placement of the abrasive paper in a double pass is 1.2 mm. The abrasive wear resistance is determined from two parallel tests with the 150XHM steel samples and a standard sample (9X5МФС roller steel). The comparison is based on the relative wear resistance where ΔM st is the mass loss of the standard 9X5МФС roller steel sample after quenching from 900°C and low tempering (ΔM st = 0.4100 g); ΔM sa is the mass loss of the tested sample. To obtain more complete information regarding the life of 150XHM steel in abrasive wear, each sample is tested in two conditions:⎯with rigorous friction on fresh 14A32MN481 abrasive paper (mean particle size 140 μm); ⎯with moderate friction on repeatedly used 14A32MN481 abrasive paper (mean particle size 40 μm).The samples are tested with constant unit load 1 MPa on two 30 m segments of frictional path.The initial sample structure consists of tempering sorbite, nonuniformly distributed sections of carbide eutectic (ledeburite; around 5%, on average), and sec ondary cementite along the grain boundaries (Fig. 1a), with a mean hardness of 300 HV.After quenching from 850°C, the structure con tains not only martensite but excess cementite (Fig. 1b). After quenching from 1000°C, the structure consists of fine martensite needles with intragrain car Abstract-The influence of the quenching temperature on the quantity of residual austenite, its stability, and its ease of deformational martensitic transformatio...

The Role of Metastable Austenite for Improving Abrasion Wear Resistance of 150KhNML Perlite Steel

“…The mentioned features of the influence of t quen on the wear resistance of 150KhNML steel confirm the published data about the positive role of residual austenite of a certain composition and its metastability with regard to deformation-induced martensite transformation in provision of high abrasion resistance [2]. The increase in wear resistance is stipulated by the increase in the content of deformation α martensite with a high carbon content on the wear surface with an increase in t quen and by an increase in the ability of residual austenite to friction hardening.…”

“…However, a higher cost and technologically efficient variant is provided by monolith fabrication from tool steels, for instance, 150KhNML pearlitic steel. It was demonstrated that high temperature quenching can improve abrasion resistance of Kh12MF and 150KhNML steels with approximately the same carbon content of 1.5% [2,3].…”

Mechanical Properties Improvement Evaluation of Medium Carbon Steels Quenched in Different Media

“…Tables 2 -4 also show variations of heating temperatures (HT) and soaking times (ST). The ranges of temperature used in the present study were less than that of Filippow et al [13]. They used a temperature range of 800°C and 1200°C and observed that there was a drop in hardness as the quenching temperatures increases.…”

The Influence of Thermal Processing on the Structure and Wear-Resistance of Perlite-Class Steels

“…2) обес-печивает высокую твердость (61 HRC). Однако максимальная износостойкость при абразивном изнашивании достигается после высокотемпературной закалки стали (1100÷1175 °С), формирующей мартенситно-карбидную структуру с метастабильным аустенитом в количестве 10-15 % и высокой способностью к фрикционному упрочнению [15][16][17][18][19][20].…”