http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
스테인리스강의 가스질화에 미치는 열처리 조건의 영향에 관한 연구
김한군 ( H. G. Kim ),황길수 ( G. S. Hwang ),선철곤 ( C. G. Sun ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.2
N/A Nitrided compound layer and diffusion layer structure were observed by SEM. The compound layer and the constituent of nitrided surface of STS 304, STS 316, STS 410 and SACM 645 steel were analysed using EMPA and XRD respectively. The depth of nitriding layer that is obtained from similar nitriding condition decrease in the order of SACM 645>STS 410>STS 316>STS 304. Result of phase transformation of the nitrided at 550℃ by XRD analysis were as follows; The austenitic stainless steel was mainly consist of Cr_2N accompanying with Fe_4N and Fe_2-3N phase and martensitic stainless steel was mainly consist of present Fe_2-3N+Cr_2N phase, but SACM 645 steel was Fe_2-3N phase present only.
김영훈,선철곤,김한군 ( Young Hoon Kim,Cheol-Gon Sun,Han Goon Kim ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.3
The heat treatment charaterristic of SCM 440 and B 16 steels has been investigated in various condition(A, B and C) to the effect of heat treatment on mechanical properties, and the following results were obtained 1. We are obtained a good nitriding characteristic in bainitic structure than other heat treatment cycle in our experiment 2. Fatigue characteristic has shown in order of B>C>A condition as heat treatment cycle 3. The effective hardening depth and fatigue characteristic has been excellented in B 16 than SCM 440 after the nitriding and Q. T for B and C condition 4. Nitriding depth has been increased in addition of Cr, V and the nitriding efficiency is increased as easiness of banite formation to wide range of cooling rate by addition of Mo 5. The depth of compound layer in parallel surface, notched slop plane and notched bottom has been varied to the nitriding depth of 5, 4 and 3μ in relatively uniform pattern after 10h nitriding treatment for SCM 440 into A condition
선철곤,김영훈,김한군 ( C . G . Sun,Y . H . Kim,H . G . Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.3
We were studied to the effect of alloying element and retained austenite on a mechnical properties and that used steels were composed three types composition. According to the soaking temperature, a retained austenite was pricipitated in the bainitic ferrite matrix and it was pricipitated to a flake type of about 2㎛, a mixture of massive and bar type and a flake type of about 1㎛ size. Through x-ray diffraction analysis, the amount of retained austenite was increased with addition of Si and Ni for equal heat treatment condition and it was best abundanted in the soaking temperature of 855℃. The balance value of strength and elongation were complexly controlled not only a retained austenite formation but also a formation characteristic and shape of the retained austenite and bainite. The balance value of strength and elongation were most satisfactory obtained with B and C specimens in a firstly heat treated at 855℃ and the best result was that a 2840㎏/㎟.% with the heat teratment condition of 855℃-400℃ used for C specimen.
이상길,강순배,정병호,김한군 ( Sung Gill Lee,Sun Bae Kang,Byong Ho Jung,Han Goon Kim ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.4
SCM 415 has been vacuum carburized in the carburizing pressure of 60-65kpa and the carburizing temperature of 1233k and 1273k after varied to 0-20 in the ratio of N₂/C₃H_8 and then diffusion treated for various times at 1123k. The results obtained from the experiment are as follows. 1. With increasing from 0 to 20 in ratio of N₂/C₃H_8 the sooting formation of surface after carburizing considerably decreased. 2. The hardness control and surface carbon content of carburizing surface has been modified by the addition of nitrogen to the propan. 3. The appoximate value of k is indirectry calculated at 1123k which results are obtained to 0.58×10^(-2)(wt.%.s^(-1/2)). 4. A great deal of propan by addition of nitrogen gas in carburizing gas was possible to saving without considerable change in case hardening depth. 5. The effective carburizing depth range is obtained to 0.8-1.1㎜ by diffusion temperature of 1123k after carburization at 1273k-3.6ks, and the surface hardness is increased as the increasing of T_D/T_C in our experimental condition, and the maximum hardness as reachin distance from surface is decreased.
이상길,강순배,정병호,김한군 ( Sang Gil Lee,Sun Bae Kang,Byong Ho Jung,Han Goon Kim ) 한국열처리공학회 1990 熱處理工學會誌 Vol.3 No.3
SCM 21 and D.P steel were carburized in vacuum using prophane at a temperature ranging from 1228k to 1308k under a gas pressure ranging from 21.3kpa to 61.8kpa, and the following results were obrained. 1) D.P. steel has considerable efficiency in depressing the grain growth during the high temperature carburizing and it has fine structure even at 1268k for 14.4ks when carburizied. Therefore this steel is expected to be suitable for vacuum carburizing at a high temperature. 2) Case depth was increased as the carburizing temperature increases and it was 3.2㎜ at max, temperature of 1308k, for max, time of 14.4ks and under max, pressure of 61.8kpa. Thus vacuum-carburizing was considered effective for the materials which need case depth, which is necessary for machine structure use. 3) The rate of case depth of SCM 21 was faster than D.P. steel under same carburizing conditions and the increasing rate of the case depth was constant. 4) Case depth was increased as the gas pressure becomes high under same carburizing temperature. 5) Case carbon concentration, C_s, of SCM 21 obeys to a formula, C_s=kt^½+C_0 Where k is 2.15×10^(-2)(wt%.S^(-1/2)) and this value is a little bit lower than that of SNCM 815.