• Title/Summary/Keyword: SS41

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Adhesion Characteristics of Polymers and Ceramic Surface Coated on Metal by Plasma Spray (플라즈마 용사법에 의한 금속면에 세라믹 코팅된 표면과 범용고분자와의 접착특성)

  • Lee, Gyeong-Hui;Gwon, Sun-Hun;Jo, Won-Je;Ha, Chang-Sik
    • Korean Journal of Materials Research
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    • v.9 no.7
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    • pp.724-734
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    • 1999
  • The adhesion characteristics of the thermoplastic resins such as PE, PP PVC, PET and PS were investigated on the surfaces of conventional steel (SS41), steel (SS41P) treated with ultrasonic waves and the SS41P coated with several ceramic powders (SS41PC) by the plasma spray. Alumina (Al$_2$O$_3$), alumina titania (Al$_2$O$_3$95%, TiO$_2$ 5%) and zirconia yttria (ZrO$_2$ 95%, $Y_2$O$_3$5% ) were used for the materials plasma spray The morphologies, surface hardness, surface roughness, and contact angles on SS41, SS41P, and SS41PC were examined. The tensile shear strength and peel strength of the polymers which were attached to the surfaces of ceramics coated on SS41P also were measured. The tensile shear strength and peel strength of polymers adhered to ceramic surface coated on steel were found to be stronger than those of conventional steel. The tensile shear strength and peel strength of the polymers adhered on the surfaces of ceramics coated steel increased in the following order PE > PET > PP > PS > PVC. The high adhesion strength of PE may be attributed to the surface roughness and its anchor effect on the ceramic surface.

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A study on the fatigue fracture behavior of laminated composites (층상복합판재의 피로파괴거동에 관한 연구)

  • 권영준;신창균
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.12 no.4
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    • pp.755-759
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    • 1988
  • Laminated Composites, SS41-Cu-SS41 plates are made by brazing bonding and hot bonding process. Fatigue repeated plane bending tests are carried out and the fracture behavior of Laminated composites, SS41-Cu-SS41 plates are compared with that of homogeneous steel, SS41plates. The following results are obtained; (1) The fatigue life of the brazing bonding plates is higher than those of SS41 plates and hot bonding plates under high stress. (2) The relations between the fatigue crack growth rate, da/dN and stress intensity factor are, da/dN=4.7*10$^{-10}$ $K^{3.20}$, for SS41 da/dN=7.8*10$^{-9}$ $K^{2.43}$, for CAH da/dN=3.6*10$^{-9}$ $K^{2.54}$, for CAB da/dN=1.58*10$^{-9}$ $K^{2.94}$ , for PAH da/dN=1.23*10$^{-9}$ $K^{2.69}$, for PAB

High Temperature Oxidation Behavior of Plasma-sprayed Ti(Al,O)/$Al_2O_3$ Coatings on SS41 Steel (Ti(Al,O)/$Al_2O_3$ 플라즈마 코팅한 SS41의 고온산화 거동)

  • Choi, G.S.;Woo, K.D.;Lee, H.B.;Jeon, J.Y.
    • Journal of the Korean Society for Heat Treatment
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    • v.20 no.5
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    • pp.231-236
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    • 2007
  • High velocity oxy-fuel (HVOF) spraying was used to coat Ti(Al,O)/$Al_2O_3$ powder onto the SS41 steel plate. Macrostructure of the coated specimen has been investigated by scanning electron micrograph (SEM). High temperature oxidation behavior of the coated specimen and SS41 steel have been studied. From the results of SEM observation, Ti(Al,O)/$Al_2O_3$ powder was coated well onto the substrate SS41 steel. Porosity onto the coated layer was only 0.38%. The oxidation results showed that Ti(Al,O)/$Al_2O_3$ powder coated SS41 steel have improved little oxidation resistance at $900^{\circ}C$ in air, but improved remarkably oxidation resistance at $800^{\circ}C $ in air compare to the substrate SS41 steel.

An Experimental Study on the Fracture Behavior for Flash Butt Welding Zone (Flash Butt 용접부의 파괴거동에 관한 실험적 연구(I))

  • 김용수;신근하;강동명
    • Journal of the Korean Society of Safety
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    • v.7 no.1
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    • pp.65-72
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    • 1992
  • Objective of this research is to evaluate fracture behaviors of fresh-butt welded metal by the acoustic emission technique. The specimens used are medium carbon steel(SM45C), mild steel (SS41) and stainless steel(SUS304), which have different weldability. The similar welding and dissimilar welding processes are considered, in the former SM45C, SS41 and SUS304 are used, in the later the following metals are used SM45C and SS41, SM45C and SUS304 and SS41 and SUS304. The characteristics of fracture in weld metal are eshmated by the tension test with nominal speciemns, the fracture toughness test with compact tension specimens and fractography analysis. The results of tension test show for base metals and similar welding materials that the yield strength and ultimate strength of similar welding materials are increased, the elongation of those are decreased. The weldability of SUS304 is better than that of SM45C and SS41 In similar welding materials. Mechanical properties of dissimilar welding mateiiths we lower than those of similar welding materials. In dissimilar welding materials, the weldability of SM45C and SUS304 is better than that of SM45C and SS41, and also weidability of SS41 and SUS304 is better than SS41 and SM45C. Comparing mechanical properties with AE counts, it is found that AE conuts appeared on a small before the limit load of elasticity(P$_{e}$), and apper greatly near yield strength region in tension test. These results could contribute to the safety analyses and the evaluation of strength for welding structure.e.

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X-ray diffraction study on fatigue fractured surface of SS41 Steel (X-선 회절에 의한 SS41강의 피로파면해석)

  • 오세욱;박수영;김기환;김태형
    • Journal of Ocean Engineering and Technology
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    • v.8 no.1
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    • pp.114-122
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    • 1994
  • X-ray stress constant, K, was determined for the diffraction line of (211)plane by using Cr-K$\alpha$ radiation. K was -340.87 MPa/deg. Fatigue crack propagation tests of SS41 steel were conducted under stress ratios of 0.1, 0.3 and 0.5. The half-value breadth of X-ray diffraction profile was measured at and beneath the fracture surface. The half-value breadth, B, on the fracture surface was found to increase with increasing $K_max$. The value of B was influenced by stress ratio in SS41 steel. The half-value breadth took the maximum value at the borden of reversed plastic zone, while it approached to the initial (pre-fatigue) value near the boundary of monotonic plastic zone. The maximum depth of the plasticzone was evaluated on the basis of the half-value breadth distribution. The depth $\omega$$_y$ is related to $K_max$by the following equation : $\omega$$_y$ = $\alpha$($K_max$/$\sigma$$_y$$)^2$ where .sigma.$\sigma$$_y$ is the yield strength obtength obtained in tension test .alpha.is 0.136 for SS41 steel.

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An Evaluation of Dynamic Crack Initiation Toughness in SS41 Steel Welding (SS41강 용접부의 동적균열개시인성 평가)

  • 정재강;김건호
    • Journal of Welding and Joining
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    • v.12 no.2
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    • pp.108-118
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    • 1994
  • In the present study, the dynamic crack initiation toughness and total absorbed energy behavior of Heat Affected Zone(HAZ) was experimentally evaluated for SS41 steel welding. The materials were submerged arc-welded SS41 steel plate with thickness 19mm. The test temperature range was from $20^{\circ}C$(room temperature) to $-70^{\circ}C$ The HAZ of welding were divided into three sub-zones for analysis; H1, H2, H3, according to the distance from the fushion line. From the experimental studies, the reference value of dynamic crack initiation toughness $(J_{Id(R)})$ can be use to estimate dynamic fracture toughness characteristics of steel welding.

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The Porosity Control Technology of Lap Joint Welding Using Continuous Wave Nd:YAG Laser of the Low Carbon Steel SS41 (저탄소강 SS41 연속파형 Nd:YAG 레이저 겹치기 용접의 기공제어 기술)

  • Lee, Ka Ram;Hwang, Chan Youn;Yang, Yun Seok;Park, Eun Kyeong;Yoo, Young Tae
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.4
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    • pp.665-672
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    • 2013
  • With the development of advanced processing technology, laser processing systems, which require high-quality precision processing, have attracted considerable attention. Although laser equipment is expensive, it enables quick processing and less deformation of materials. This technology is often applied to secondary batteries, which has thus farinvolved the use of argon tungsten inert gas (TIG) welding. However, the welding characteristics of argon TIG welding are not yet good, and a laser is used for welding to address this problem. In this study, lap-joint welding was conducted, and the desired welding characteristics were obtained when the laser power was 1800W and the laser beam travel speed was 1.8 m/min. Lap-joint welding was conducted on Ni-coated SS41. Two cases were compared. No pores were observed in the Ni-coated SS41 lap-joint welding part, and cracks appeared from the lap-joints. Moreover, the pole rod and tap were welded together in a T-joint form to improve the output of the secondary battery. T-joint laser welding showed better welding characteristics than TIG welding.

An Evaluation of the Fracture Behavior for Flash Butt Welding zone by Acoustic Emission Method (AE방법에 의한 Flash Butt 용접부의 파괴거동 평가)

  • 김용수;이하성;강동명
    • Journal of the Korean Society of Safety
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    • v.9 no.1
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    • pp.9-18
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    • 1994
  • In this study, we conducted experimental tests to evaluate fracture behaviors of fresh-butt welded metal by Acoustic Emission technique. We selected similar welding and dissimilar welding process, the one welded for SM45C, SS41 and SUS304 of each material, the other for SM45C and SS41, SM45C and SUS304 and SS41 and SUS304. The fracturing processes of weld metal were estimatied through the fracture toughness test with compact tension specimens and fractography analysis. In ASTM test method E-399, type I curves for materials of this study were obtained by load-cod diagram of fracture toughness test. and 5% offset load( $P_{5}$) was estimated as the estimated crack initial load( $P_{Q}$), The estimated crack initial load( $P_{Q}$) of similar welding materials generally lower than base matal, and then SM45C appeared greatly in decreasing rate of PB, SS41 and SUS304 appeared in order. $P_{Q}$ of dissimilar welding materials were lower than the similar welding materials. $P_{Q}$ of welding of SM45C and SS41 appeared in small, SUS304 and SS41 appeared greatly in dissimilar welding materials. In fracture toughness test, AE counts increased before the inflection point of the slope, decreased after that. It was found that increasing of AE counts were due to the microcrack formation at the crack tip near the $P_{5}$ point through AE data. For welding materials in this study, both low and high AE amplitude appeared simulataneously. It was confirmed that the low AE amplotude was due to formation of micro void, micro crack or micro dimple, the high AE amplitude was caused by microvoid coalescence and quasi-cleavage fracture through analyses of fractograpy.apy.apy.apy.

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A Study on the Fatigue-Fractured Surface of Normalized SS41 Steel and M.E.F. Dual Phase Steel by an X-ray Diffraction Technique (X-선 회절에 의한 SS41 불림재와 M.E.F. 복합 조직강의 피로 파단면 해석에 관한 연구)

  • Oh, Sae-Wook;Park, Young-Chul;Park, Soo-Young;Kim, Deug-Jin;Hue, Sun-Chul
    • Journal of the Korean Society for Nondestructive Testing
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    • v.16 no.1
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    • pp.10-18
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    • 1996
  • This study verified the relationship between fracture mechanics parameters and X-ray parameters for normalized SS41 steel with homogeneous crystal structure and M.E.F. dual phase steel(martensite encapsulated islands of ferrite). The fatigue crack propagation test were carried out and X-ray diffraction technique was applied to fatigue fractured surface. The change in X-ray parameters(residual stress, half-value breadth) according to the depth of fatigue fractured surface were investigated. The depth of maximum plastic zone, $w_y$, were determined on the basis of the distribution of the half-value breadth for normalized SS41 steel and that of the residual stress for M.E.F. dual phase steel. $K_{max}$ could be estimated by the measurement of $w_y$.

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