Microstructural aspects of biaxial stretchability of low carbon steel sheets.
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Microstructural aspects of biaxial stretchability of low carbon steel sheets. by Oscar Acselrad

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Published by University of Birmingham in Birmingham .
Written in English

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Thesis (Ph.D.)- University of Birmingham, Dept. of Industrial Metallurgy, 1978.

ID Numbers
Open LibraryOL20009082M

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  Our previous research showed that as 5 wt % LMPP blended to PP had the best stretchability, various 5 wt % blended samples were prepared. Iso‐polypropylenes A blended with 5 wt% of various LMPP, namely L1, L2, and L3, was formed into ‐μm sheets of A/L1, A/L2, and A/L3, respectively under the resin temperature of °C at the die exit and the chill roll temperature of 30° by: 1. In this study, low-carbon steel ( wt.% C) in ferritic-pearlitic (FP) and ferritic-martensitic (FM) initial states were processed by high pressure torsion (HPT) up to 10 turns under a pressure of 6 GPa at room temperature (RT). The HPT-processed FM samples were tempered at oC to oC. The microhardness monotonically increased with the number of turns up to 10 : Khaled Salman Adwan Husain. Herein, the mechanical properties and microstructural evolution of low carbon steel treated by two-step Q&P process are investigated. The effect of the heat treatment process parameters on the phase fraction and carbon concentration of the retained austenite is studied in detail, and the contribution of retained austenite to the mechanical properties of the steel is by: Sheet metal is a critical material for vehicle design, due to its design versatility and manufacturability. Low carbon sheet steel has long been the workhorse material in consumer industries because it can be stamped into inexpensive, complex components at very high production rates.

The low-carbon steel (~ wt%) with complete martensite structure, obtained by quenching, was cold rolled to get the high-strength steel sheets. Then, the mechanical properties of the sheets were measured at different angles to the rolling direction, and the microstructural evolution of low-carbon martensite with cold rolling reduction was. Stretchability and Properties of Biaxially Oriented Polypropylene Film The biaxial stretchability of PP has not been reported in any detail. In the previous report, the relationship among stretchability, The resin which has very low MI below is easy to break.   Low carbon steel produce ‘lath’ martensites while high carbon steels produce ‘plate martensite, often called ‘acicular’ martensite, when all the carbon is dissolved into the austenite. The strength and hardness of martensite varies linearly with carbon in austenite upto about % C.   When a very small fraction of the interstices in between the iron lattice is occupied by carbon atoms, this interstitial-free (IF) steel is said to have a microstructure of ferrite. Ferrite has a body-centered cubic (BCC) crystal structure (see Figure 2a). Ferrite is a microstructural phase that is soft, ductile, and similar to pure iron.

In Fig. 9, the low carbon concentration of the steel allows much more allotriomorphic ferrite to form with the grains therefore appearing equiaxed because of the effects of hard impingment. The amount of pearlite is reduced because of the lower carbon concentration of the steel.   Effects of Mechanical Properties on Biaxial Stretchability of Low Carbon Steels The response of low carbon steel sheets to biaxial tension forces was studied in stretch cup tests of 3 and 8 in. by: 8. But the biaxial stretchability changes of polypropylenes and the reasons for such have not been reported upon systematically. In this report, the relationship between stretchability and material design of various polypropylenes (PP) for biaxially oriented film, . Low carbon steel is the most common form of steel due to the fact that its material properties are acceptable for many applications (Al-Qawabah et al. ). Low carbon steel also called mild steel have % carbon content, and manganese content below %, with maximum value for silicon, at %. Low carbon steels are utilised to.