CWB Level 3 Module 24 Basic Metallurgy and Welding Metallurgy of Aluminum
Complete the following: a) Chromium stabilizes the _____ form of iron b) Nickel stabilizes the _____ form of iron - ans ---a) bcc b) fcc If a straight chromium steel of 18% Cr and 0.1 % C is heated to 1000°C will it transform to austenite or remain as ferrite? - ans ---remain as ferrite What is the predominant structure of an 18% Cr, 8% Ni steel at room temperature? - ans ---austenite The chromium content of a stainless steel is 20%. Is it likely this is a martensitic grade? - ans ---No, Martensitic grade is 18% to 11.5% Cr A 14% Cr martensitic steel heated to 1000°C and air cooled produces a) ferrite b) aus1enite c) martensite - ans ---c) martensite Does an austenitic stainless steel have a greater or lesser work hardening rate than carbon steel? - ans ---greater A carbon steel component operates satisfactorily at 500°C under a stress of 50MPa. If 304 stainless were substituted, up to what level could the temperature be raised? - ans ---600°C, 20% more then carbon The loss of corrosion resistance due to carbide formation and chromium depletion is known as: a) sigma formation b) sensitization c) stabilization - ans ---b) sensitization What maximum carbon level is usually specified to ensure freedom from sensitization during welding? a) 0.03%
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