Materials Applications - Lecture 1 - Material Engineering, Lecture notes of Material Engineering

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Materials Applications

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Low Carbon Steel

 Plain carbon steels have very little additives (alloying elements) and small amounts of manganese.  Most prevalent type of steel is low carbon steel (greatest quantity produced; least expensive).  Low carbon not responsive to heat treatment; have to cold work.  Weldable and machinable.  High Strength, Low Alloy (HSLA) steel contains alloying elements (copper, vanadium, nickel and molybdenum) up to 10 wt %; they have higher strengths (than plain LC steels) and may be heat treated.

Hot Rolling

 Hot rolling is a hot metalworking process where large pieces of metal (slabs or billets), are heated above their recrystallization temperature (1/3 Tm< Hot roll <1/2 Tm) and then deformed between rollers to form thinner cross sections.  Hot rolling produces thinner cross sections than cold rolling processes with the same number of stages.  Hot rolling, due to recrystallization, will reduce the average grain size of a metal while maintaining an equiaxed microstructure where as cold rolling will produce a hardened microstructure. roll Ao Ad roll