Постинг
23.06.2010 21:05 -
Научен доклад относно нови износоустойчиви сплави, публикуван. Международна конференция Истанбул
Автор: bogomil
Категория: Технологии
Прочетен: 2726 Коментари: 1 Гласове:
Последна промяна: 25.06.2010 17:12
Прочетен: 2726 Коментари: 1 Гласове:
1
Последна промяна: 25.06.2010 17:12
"I Of International Metallurgy and Materials Congress / 24-28. OS. 2000 I Jm Uluslararasi Metalurji ve Malzeme Kongresi / Istanbul. TORKIYE
STUDY ON WEAR RESISTANCE OF COMPLEX ALLOYED ALLOYS OF THE SYSTEMS Fe-Cr-C AND Fe-Cr-C-N
Dr.Eng.Bogomil Velikov KOLEV
Institute of Metal sciemce,67 Shipch.prohog str. Sofia 1574
ABSTRACT
It is obtained a series of cast alloys in the systems Fe-Cr-C and Fe-Cr-C-N with and without additional alloying with other carbide or nitride forming (V, W, Mo, Ti, B, Nb ) introduced together or separately in combinations with stabilising austenite elements in controllable quantities (Mn, Ni, Cu, N) and modifying (Mg, Ce, Zr, ) having to 6-10 times better wear resistance under friction in comparison with Hatfield steel CllOMnU. After thermal treatment the alloys possess strength tensile aa 50-110.I07Pa, impact strength 8k=0,3-1,2.10!Pa J/m2, 40-67HRC, quenching -over 200mm. There are created also complex allpyed founded wear resistant alloys of the systems Fe-Cr-C; Fe-Cr-C-N, protected with patents (claim) and innovations RB 49451, RB26110, RB23669 which have much better treatability with, cutting instruments than Hatfield steel C110Mnl3 and better impact strength than practically non-treatable with cutting instruments cast irons: Nichard, Cr28Ni2, than austenite cast iron. Crl4N(0,95)Mnl2; Crl4Ni3Mn4 and austenite cast iron from the systems Fe-Cr-Mn-C-(N).
Key words: New cast alloys, system Fe-Cr-C-N, wearresistance, structure, properties 1.INTRODUCTION
The basic exploitation means of complex alloyed founded alloys the systems Fe-Cr-C and Fe-Cr-C-N with and without additional alloying is wear resistance (1-2] During last round 10-15 years data show cast iron of system Fe-Cr-C (without N ) are said to be alternative of wearresistance materials for working in abrasion conditions.[4]. Data for their physicomechanic and exploitation are rare, especially by observation [1-4]. There are no data for wear resistance complex alloyed cast alloys of system Fe-Cr-C-N, as well as influence of basic components on it. The work presents development of patent claim RG 49451. Results of laboratory study are confirmed by tests in industrial conditions on concrete casts.
2.EXPEREVIENTAL PROCEDURES
The aim of the research is to evaluate the wear resistance of complex alloying of the system Fe-Cr-C-N, i.e to study the influence of the basic components C, N, Cr and on the basis of the obtained results to determine the directions of applications. To this aim we studied a large number of cast alloys with different Cr.=4-32%, N=0,02-2,l%, Mo=0,01-3%, V=O,O1-1%, B=O,0001-0,3%), W= 0,01-1%, Ce and/or Mg and/or Zr 0,01-0,5% and the rest Fe (patent claim RB 49451). Alloys are obtained in induction autoclave and have been cast in dry sand form in samples after heating [5] are worked out plates with dimentions 32x20x3 mm which . after quenching and burnishing of all sides have been subjected to wearing in an own constructed and built machines, fig. 1. Wearing is carried in conditions of abrasive, hydroabrasive influence with moderate impact pressure. Evaluation of wear resistance by the
weight method. Destroyed samples for testing of impact strength have been used for determining wear resistance by the method of friction on machine "Skoda-Savin". About the extent of wearing in both methods of testing we judged by coefficients of relative wear resistance calculated by the formulae: AG Su^^/AO umpi« body, where AG- respective average arithmetical value of weight losses of respective samples (steel 3-0,3%C); steel 45 (0,45%C), Hatfield steel type Cl 10Mnl3 and C45Cr20Nil2Mn2 Si2 and sample bodies. We studied the influence of C, Cr and N on wearing. The bodies of steel C110Mnl3 are quenched in water atll30°C. The results are compared to those of some wear resistant alloys: cast iron "Nichard", cast irons Cr28Ni; Cr3ONi3, austenite cast irons of the type Crl5Ni3Mn4; Crl2NNMnl2. The last cast iron enters in patent RB31141. Since in present it is impossible to present the results of all studies, we will present generalised observations and conclusions from the laboratory testing and practical survey; fig2, 3, table 1-4. . RESULTS AND DISCUSSION Alloys possess good wear resistance, which their hardness is higher than that of the abrasive [1-4]. For the testing we used powder corundum with grains of lmm and hardness 1800Hv. The quartz sand has a hardness of 950-1150Hv. Of the most common abrasives only the Si carbide and diamond posses higher hardness than the common corundum. From the phases and structure components lower hardness than corundum have:ferrite-70-200Hv; austenite-70-200Hv; non-alloyed perlite 250-320Hv; alloyed perlite- 300-400Hv; austenit of the C110Mnl3-170-230Hv. Low alloyed austenite -250-350 Hv; austenite in alloyed cast iron-360-600Hv; manenzite-500-1000Hv, cimentite 840-1 lOHv; molybdenum carbide-1500Hv; Cr7Cr1200-1600Hv; Cr2jC
weight method. Destroyed samples for testing of impact strength have been used for determining wear resistance by the method of friction on machine "Skoda-Savin". About the extent of wearing in both methods of testing we judged by coefficients of relative wear resistance calculated by the formulae: AG Su^^/AO umpi« body, where AG- respective average arithmetical value of weight losses of respective samples (steel 3-0,3%C); steel 45 (0,45%C), Hatfield steel type Cl 10Mnl3 and C45Cr20Nil2Mn2 Si2 and sample bodies. We studied the influence of C, Cr and N on wearing. The bodies of steel C110Mnl3 are quenched in water atll30°C. The results are compared to those of some wear resistant alloys: cast iron "Nichard", cast irons Cr28Ni; Cr3ONi3, austenite cast irons of the type Crl5Ni3Mn4; Crl2NNMnl2. The last cast iron enters in patent RB31141. Since in present it is impossible to present the results of all studies, we will present generalised observations and conclusions from the laboratory testing and practical survey; fig2, 3, table 1-4. . RESULTS AND DISCUSSION Alloys possess good wear resistance, which their hardness is higher than that of the abrasive [1-4]. For the testing we used powder corundum with grains of lmm and hardness 1800Hv. The quartz sand has a hardness of 950-1150Hv. Of the most common abrasives only the Si carbide and diamond posses higher hardness than the common corundum. From the phases and structure components lower hardness than corundum have:ferrite-70-200Hv; austenite-70-200Hv; non-alloyed perlite 250-320Hv; alloyed perlite- 300-400Hv; austenit of the C110Mnl3-170-230Hv. Low alloyed austenite -250-350 Hv; austenite in alloyed cast iron-360-600Hv; manenzite-500-1000Hv, cimentite 840-1 lOHv; molybdenum carbide-1500Hv; Cr7Cr1200-1600Hv; Cr2jC
Научни доклади на международна конференц...
Научен доклад, относно нови износоустойч...
New fees for registration of an internat...
Научен доклад, относно нови износоустойч...
New fees for registration of an internat...
1.
анонимен -
how to unlock iphone 4 f4
07.08.2011 18:21
07.08.2011 18:21
unlock iphone 4
iphone 4 unlock
how to unlock iphone 4
http://www.macygray.com/node/228 http://biznik.com/articles/crowdsourcing-your-graphic-design-work-its-bad-for-you-i-have-proof
After my computer was infected with verious viruses, I removed the antivirus and installed a new antivirus and scanned my laptop. After this scanning, the laptop hybernate option does not work. Some alert comes and says that the computer doesn't have enough ( ) to load hybernate option. So if any one of u could tell me the reason and the solution of this problem, i will be pleasured.
<a href="http://unlockiphone44.com">unlock iphone 4</a> how to unlock iphone 4
unlock iphone 4 <a href=http://unlockiphone44.com>unlock iphone 4</a> iphone 4 unlock unlock iphone 4
цитирайiphone 4 unlock
how to unlock iphone 4
http://www.macygray.com/node/228 http://biznik.com/articles/crowdsourcing-your-graphic-design-work-its-bad-for-you-i-have-proof
After my computer was infected with verious viruses, I removed the antivirus and installed a new antivirus and scanned my laptop. After this scanning, the laptop hybernate option does not work. Some alert comes and says that the computer doesn't have enough ( ) to load hybernate option. So if any one of u could tell me the reason and the solution of this problem, i will be pleasured.
<a href="http://unlockiphone44.com">unlock iphone 4</a> how to unlock iphone 4
unlock iphone 4 <a href=http://unlockiphone44.com>unlock iphone 4</a> iphone 4 unlock unlock iphone 4
Вашето мнение
За да оставите коментар, моля влезте с вашето потребителско име и парола.
