Embedded Mold Temperature Sensor
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1 ANNUAL REPORT 2006 Meeting date: June 15, 2006 Design & Installation of Novel Sensors into the Continuous Casting Mold Michael K. Okelman (Combined BS/MS Student) & Brian G. Thomas Department of Mechanical & Industrial Engineering University of Illinois at Urbana-Champaign Embedded Mold Temperature Sensor Problem Statement Sensor Strip Fabrication & Design Sensor Installation Procedure Plating over the Sensor review current plating trials Dip test sensor testing computational assistance University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 2
2 The Continuous Casting Mold (images courtesy Brian Thomas, personal communication) University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 3 Schematic of Initial Solidification what s the temperature behavior in this region? Liquid flux film (low friction) Meniscus Solidified Flux Flux Rim Flux Powder Liquid Flux Steel surface level Oscillation Mark Solidifying Steel Shell Solid flux film (high friction) Copper Mold (images courtesy Brian Thomas, personal communication) Molten Steel Pool Contact Resistances Air Gap University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 4
3 Installation of Sensor Strip into Continuous Casting Mold 3D View y x z mold top 150mm sensor 140mm 0.3mm Nickel plating meniscus 2.0 x 0.1 mm sensor strip 12mm Copper mold y x cross-section view through meniscus water slot conventional embedded thermocouple (images courtesy Brian Thomas, personal communication) University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 5 Prediction of Longitudinal Cracks by Interpreting Thermocouple Signals Computer (interpretation of signals) high-speed serial network MTM System Control-room Operator Display Plant Signals Data Acquisition Cubicle Instrumented mold Thermocouple Data Acquisition Cubicle Juntion Box Spray Chamber Compensating Cables Analysis system developed by British Steel, Sidmar, and CRM D. Stewart, P.N. Hewitt and L. Peeters: "The Prediction of Longitudinal Cracking During Slab Casting", in Steelmaking Conference Proceedings, vol. 79, ISS, Warrendale, PA, Pittsburgh, PA, 1996, pp University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 6
4 Hypotheses Regarding Plating Trial in Vertical Plating Tank sensor strip dogleg (sensor strip contacts mold and is therefore grounded) if sensor is NOT grounded 1 mm if sensor is grounded 1 mm Cu Ni plating Ni plating side view Cu University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 7 Commercial Plating Trial in Vertical Plating Tank top view thickness mm University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 8
5 Analyzing the Commercially Plated Copper Coupon Did nickel deposit, and at what combination of width & gap? Did nickel adhere to the copper, sensor, or both? Metallography to be performed at UIUC this summer There is a good possibility that the sensor strip must be attached to the copper before plating. Fortunately, there are alternatives University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 9 Methods to Attach Sensor Ultrasonic welding two members subjected to static normal force & oscillating shearing stresses no melting and fusion take place can join dissimilar metals Diffusion bonding/welding joint results from atoms moving across the interface & some plastic deformation requires temperatures of about 0.5T m parts heated & pressure is applied suitable for dissimilar metals Silver paste bakes in 2 hours electrically & thermally conductive (k=109 W/m-K) inorganic adhesive & coating applications to 1200 F easy to perform a trial University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 10
6 Attaching the Sensor with Silver Paste silver paste sensor Cu Since the conductivity of the silver paste is 109 W/mK, method is OK if: Needs secure bond between sensor strip and Cu Must have no air gaps Must survive acid pretreatment steps Must successfully be nickel plated at commercial facility Metallography will be performed at UIUC this summer University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 11 UIUC Tasks Coordinate design, manufacturing, testing, & implementation of sensor strip into CC mold between UIUC, UW-Madison, Sumitec, & Nucor Use computational results to assist in design of dip test experiments & to evaluate sensor signals Test installed sensor strip via dip test into molten steel Evaluate results of plating tests by performing metallographic analysis of samples after plating procedure after dip test into molten steel University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 12
7 What is a Dip Test? Copper block is partially submerged in molten steel for a determined amount of time The most available source of molten steel for a dip test would be a tundish Alternative to testing plated sensor in a copper mold during casting Do not interrupt the casting process or affect the mold Attempt to match the temperatures & stresses encountered in the copper mold of a continuous caster sensor strip molten steel University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 13 Using Simulations to Help Design Dip Tests What are the temperatures & stresses associated with continuous casting? perform heat transfer & thermal stress analysis literature review How can the duration of the dip test be determined? analytical solution regarding steel solidifying in a thick copper mold simulate solidification to determine temperature distribution in copper block University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 14
8 Material Properties ρ (kg/m3) k (W/m-K) Cp (J/kg-K) E (GPa) v α (/K) Cu E-05 Ni E-05 air will be used for modeling air gap under sensor (values from Kabelmetal Copper and Copper Alloy Mold Liners for Continuous Casting of Steel and MatWeb.com) University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 15 1D Heat Transfer in Bimetallic Strip Boundary Conditions: molten steel contacts the bottom of the test strip and top of the strip is water cooled convection: T water = 25 C, h= 21,000 W/m 2 -K dt/dn = 0 dt/dn = 0 24 mm copper T bottom 1 mm nickel q= 2.0E6 W/m 2 t Ni tcu = q + + T kni kcu h 1 + thermal resistance method applied to composite wall University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 16
9 Temperature Distribution in Bimetallic Strip 1D temperature distribution temperatures higher at Ni coating due to lower thermal conductivity of Ni compared to Cu comparison b/w analytical & experimental: %difference 6.82E-05 Temperature in Kelvin University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 17 Embedded Sensor Air Gap Model dip test geometry 24 mm 1 mm 50 mm 50 mm Assuming everything is working smoothly, the complexity of the model can be increased add air gap at interface incorrect plating procedure How does the behavior change? University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 18
10 Air Gap Geometry 2 mm NO ELEMENTS! 0.1 mm University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 19 Temperature Distribution 2D temperature distribution near air gap localized hot spot Temperature of nickel layer at air gap is only ~1% hotter Temperature of Cu at air gap ~5% hotter University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 20
11 Basic Procedure for Indirect Method for Thermal Stress Problems 1) Define & solve thermal problem 2) Return to preprocessor & modify the database switch element types specify additional mat l properties specify structural BC 3) Read the temperatures from the thermal results file 4) Solve the structural problem University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 21 Thermal Stress of Dip Test (No Air Gap) Max stresses: σ Cu = 67.8 MPa (compression) Cu σ Ni = 185 MPa (tension) Ni coating layer University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 22
12 Thermal Stress of Dip Test (with 0.1 mm Air Gap) Max stresses: σ Cu = 67.8 MPa (compression) σ Ni = 220 MPa (tension) Cu presence of air gap increases stress by ~19% air gap/sensor Ni coating layer University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 23 Embedded Sensor Summary Conventional thermocouples cannot accurately quantify temperature at meniscus New sensor designed for installation in copper narrow face Metallography for plated copper coupons currently underway at UIUC Computational results being used to aid in design of experimental dip tests University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 24
13 Acknowledgements Continuous Casting Consortium at University of Illinois at Urbana-Champaign National Science Foundation DMI (Sensor) X. Li, X. Cheng, U Wisconsin - Madison Mike Powers, Sumitec for sample preparation University of Illinois at Urbana-Champaign Metals Processing Simulation Lab MK Okelman 25
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