[논문]Effect of Impact Energy on the Impact-Wear Properties of High Manganese Steels in Acidic Corrosive Conditions

Wang, Kai; Du, Xiao-Dong; Wu, Kai; Youn, Kuk-Tae; Lee, Chan Gyu; Koo, Bon Heun

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The impact abrasion behavior of high manganese steel is investigated under three kinds of impact energy in acid hematite ore slurry by using a modified MLD-10 impact abrasion tester. Through the SEM observation of the worn surface and the optical metallographic analysis of the cross-sectional sample...

The impact abrasion behavior of high manganese steel is investigated under three kinds of impact energy in acid hematite ore slurry by using a modified MLD-10 impact abrasion tester. Through the SEM observation of the worn surface and the optical metallographic analysis of the cross-sectional samples, the corrosive impact abrasion mechanisms of the steel under different impact energies are studied. In acid-hematite slurry, the variations of impact energies would result in synchronous transformation of the impact abrasion properties and mechanisms of the high manganese steel in the corrosive condition, as led different corrosive impact abrasion mechanism under different impact energies.

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문제 정의

2시) But the service lives of balling liner made of these two steels have not yielded much improvement compared with high manganese steel. So it is important to figure out the corrosive impact abrasion mechanism of high manganese steel, as is useful to improve its property or develop new materials through this study. In this study, the impact corrosion and abrasion mechanisms of the high manganese steel were investigated under 0.
7 J three low impact energies. This study is useful to develop better materials for balling liner in the wet-grinding machine at metallurgical mines.

제안 방법

The particle size of the hematite ore is 1 mm ~ 5 mm, and its microhardness is 766~ 1097 Hv. In this study, the testing sample were fixed to the impact hammer by the upper sample gear, and the testing high manganese sample moves up and down reiteratively with the impact hammer along the isle onto the rotating bottom standard sample (which is a disk made of GCr15 steel (C 1%, Cr 1.5%)), the ironstone abrasive materials enters between the friction surface under the function of the agitating service. Test impact energy is 0.

대상 데이터

Corrosive impact abrasion tester used in this study is rebuilt on the base of MLD-10 impact abrasion test machine (Fig. 1). The size of corrosive impact abrasion sample is 10 mm x 10 x mm x 10 mm, the samples are cleaned in the supersonic wave cleaning machine with acetone befiore test, and then the samples are fixed on the tester after dried and weighed.

이론/모형

It is water-quenched from 1050 ℃, and single-phase austenite is obtained. Impact-toughness (ak, Jxcm-2, it is impact toughness of materials and defined as the sample absorbing impact energy divided by cross section area of the sample) is measured by JB-50 impact toughness tester according to Mesnager unnotched method (sample size is 10 mm x 10 mm x 55 mm). Hardness is determined from the corrosive impact abrasion samples.

성능/효과

1) Under different impact energies, the wear loss of the high manganese steel increases along with the increasing of the impact energies, and the impact energy has significant effect on the corrosive impact abrasion properties of the steel.
2) In the condition of impact corrosion and abrasion, the performance of the high manganese alloy steel has a corresponding relationship with its single-austenite phase of high toughness and suitable resistance to corrosion, but lack of work-hardening is the default of this steel. 3) In acid-hematite slurry, under all three test impact energies, the corrosive impact abrasion mechanism of the steel is always accompanied with the micro-plough, which is the dominate wear mechanism while under 0.
steel. 3) In acid-hematite slurry, under all three test impact energies, the corrosive impact abrasion mechanism of the steel is always accompanied with the micro-plough, which is the dominate wear mechanism while under 0.7J impact energy; when the impact energy is up to 1.2J, the impact wear mechanism expands to the low cycle fatigue fracture; while the impact energy reaches 1.7J, the mechanism alternates to the fretting fatigue delamination mechanism.

후속연구

7J. Thus, it should be possible to postulate an abrasion mechanism by more detailed investigation of the microscopic structure. The work-hardening layer is generated in the abrasive surface under the synergistic role of the impact and the abrasive particles (hardness is up to HV200500~600, and the matrix hardness is HV200225 as shown in Fig.

참고문헌 (11)

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상세보기
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상세보기
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Effect of Impact Energy on the Impact-Wear Properties of High Manganese Steels in Acidic Corrosive Conditions 원문보기

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Effect of Impact Energy on the Impact-Wear Properties of High Manganese Steels in Acidic Corrosive Conditions 원문보기

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