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- 1. Improvement of Mechanical Properties of Steel for Slat Armor Members: Ammar Rashid, M Junaid Ali, Waqas Suleman Supervisor: Dr. Khurram Yaqoob Introduction Slat Armor is specifically designed to defeat the shaped charge anti-tank warhead. The high explosive anti-tank warhead that is fired from such weapons as the rocket propelled grenade (RPG) commonly used in wars. Slat armor, also known as bar armor, cage armor and standoff armor, is a type of vehicle armor designed to protect against anti-tank rocket-propelled grenade (RPG) attacks. It takes the form of a rigid slatted metal grid fitted around key sections of the vehicle, which disrupts the shaped charge of the warhead by either crushing it, preventing optimal detonation from occurring, or by damaging the fusing mechanism, preventing detonation outright. Objectives • Characterize the previous material (which failed) • Analysis of results obtained from characterization • Improve the mechanical properties • UTS > 1000 MPa • HRC > 40 Original Sample Hardness: 20 HRC, Impact Strength: 51 KJ/m2 BCC Optical Microscopy (800x) SEM Mechanical Tests XRD Quenched in Water from 950°C Hardness: 60 HRC BCC Optical Microscopy (800x) SEM Mechanical Tests XRD STOEPowder Diffraction System 21-Apr-2015 Operator : Administrator _________________________________________________________________________________ / printed by Administrator / controlled by _________________________________________________________________________________ Div.slit = 0.500 (fixed) Rec.slit = 0.200 Range 1 : 2Theta(begin,end,step) = 10.000, 110.000, 0.040 0.5 sec/step Imax = 44 Detector : Scintillation Counter Scan Mode : Reflection Diffract.: Theta-Theta Monochrom. : Secondary Radiation : 1.54060 Cu Generator : 40 kV, 40 mA Comment : 21-04-15 Title : water File : C:XRDKhurram S.AUG SCMEME-04Amar16-04-15water.raw Created : 21-Apr-15 11:07 by POWDAT 2Theta10.0 30.0 50.0 70.0 90.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 AbsoluteIntensity water STOEPowder Diffraction System 27-Feb-2015 Operator : Administrator _________________________________________________________________________________ / printed by Administrator / controlled by _________________________________________________________________________________ Div.slit = 0.500 (fixed) Rec.slit = 0.200 Range 1 : 2Theta(begin,end,step) = 10.000, 110.000, 0.040 0.5 sec/step Imax = 63 Detector : Scintillation Counter Scan Mode : Reflection Diffract.: Theta-Theta Monochrom. : Secondary Radiation : 1.54060 Cu Generator : 40 kV, 40 mA Comment : 27-02-15 Title : Steel 1 File : C:XRDKhurram S.AUG SCMEME-04Junaid AliSteel 1.raw Created : 27-Feb-15 10:14 by POWDAT 2Theta10.0 30.0 50.0 70.0 90.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 AbsoluteIntensity Steel 1 Element • Carbon • Iron • Chromium • Cobalt • Manganese • Copper Percentage • 00.45% • 98.00% • 00.19% • 00.39% • 00.29% • 00.17% Compositional Analysis Quenched in NaCl from 950°C Hardness: 46 HRC BCC Optical Microscopy (800x) SEM SEM XRD STOEPowder Diffraction System 21-Apr-2015 Operator : Administrator _________________________________________________________________________________ / printed by Administrator / controlled by _________________________________________________________________________________ Div.slit = 0.500 (fixed) Rec.slit = 0.200 Range 1 : 2Theta(begin,end,step) = 10.000, 110.000, 0.040 0.5 sec/step Imax = 58 Detector : Scintillation Counter Scan Mode : Reflection Diffract.: Theta-Theta Monochrom. : Secondary Radiation : 1.54060 Cu Generator : 40 kV, 40 mA Comment : 21-04-15 Title : Oil File : C:XRDKhurram S.AUG SCMEME-04Amar16-04-15Oil.raw Created : 21-Apr-15 10:02 by POWDAT 2Theta10.0 30.0 50.0 70.0 90.0 0.0 10.0 20.0 30.0 40.0 50.0 AbsoluteIntensity Oil Quenched in 10% NaOH from 950°C Hardness: 42 HRC BCC Optical Microscopy (800x) SEM SEM XRD STOEPowder Diffraction System 21-Apr-2015 Operator : Administrator _________________________________________________________________________________ / printed by Administrator / controlled by _________________________________________________________________________________ Div.slit = 0.500 (fixed) Rec.slit = 0.200 Range 1 : 2Theta(begin,end,step) = 10.000, 110.000, 0.040 0.5 sec/step Imax = 111 Detector : Scintillation Counter Scan Mode : Reflection Diffract.: Theta-Theta Monochrom. : Secondary Radiation : 1.54060 Cu Generator : 40 kV, 40 mA Comment : 16-03-14 Title : Steel(Air Q) File : C:XRDKhurram S.AUG SCMEME-04Amar16-04-15Steel(Air Q).raw Created : 16-Apr-15 12:50 by POWDAT 2Theta10.0 30.0 50.0 70.0 90.0 0.0 20.0 40.0 60.0 80.0 100.0 AbsoluteIntensity Steel(Air Q) Characterization Impact Strength: 51 KJ/m2 Hardness: 20 HRC Tensile Strength: 600,653 MPa Hardness: 60 HRC Tensile Strength: 1324,1159 MPa Acknowledgments Lab Tech Imran Lab Tech Khawar Hussain Lab Tech Khurram Lab Tech Saleem Lab Tech Shams-ud-Deen Conclusion Mechanical properties were not upto the mark Water quenching after heating to 950°C gave best results