Brass, yield strength

Figure 5.15 Influence of grain size on yield strength for a 70-30 Cu-Zn brass alloy. Reprinted, by permission, from W. Callister, Materials Science and Engineering An Introduction, 5th ed., p. 167. Copyright 2000 by John Wiley Sons, Inc.

Fig. 3. The influence of grain size on yield strength of Fe, Zn and a brass (Adamczyk, 2004)...

Fom of the six alloys in Table 6.8 have yield strengths greater than 197 MPa and satisfy the design criterion for this tube— that is, steel, copper, brass, and titanium. 

Figure 7.15 The influence of grain size on the yield strength of a 70 Cu-30 Zn brass alloy. Note that the grain diameter increases from right to left and is not linear. (Adapted from H. Suzuki, The Relation between the Structure and Mechanical Properties of Metals, Vol. II, National Physical Laboratory, Symposium No. 15, 1963, p. 524.)...

FigMre 7.19 For 1040 steel, brass, and copper, a) the increase in yield strength, b) the increase in tensile strength, and (c) the decrease in ductihty (%EL) with percent cold work. 

A cylindrical rod of noncold-worked brass having an initial diameter of 6.4 mm (0.25 in.) is to be cold worked by drawing such that the cross-sectional area is reduced. It is required to have a cold-worked yield strength of at least 345 MPa (50,000 psi) and a ductility in excess of 20%EL in addition, a final diameter of 5.1 mm (0.20 in.) is necessary. Describe the manner in which... 

Let us first consider the consequences (in terms of yield strength and ductility) of cold working in which the brass specimen diameter is reduced from 6.4 mm (designated by d ) to 5.1 mm (d,). The %CW may be computed from Equation 7.8 as... 

A non-cold-worked brass specimen of aver-O age grain size 0.01 mm has a yield strength of... 

D4 It is necessary to select a metal alloy for an application that requires a yield strength of at least 310 MPa (45,000 psi) while maintaining a minimum ductility (%EL) of 27%. If the metal may be cold worked, decide which of the following are candidates copper, brass, or a 1040 steel. Why ... 

D6 A cylindrical rod of brass originally 10.2 mm (0.40 in.) in diameter is to be cold worked by drawing the circular cross section will be maintained during deformation. A cold-worked yield strength in excess of 380 MPa (55,000 psi) and a ductility of at least 15%EL are desired. Furthermore, the final diameter must be 7.6 mm (0.30 in.). Explain how this may be accomplished. 

Mixing molten copper with other metals yields a variety of alloys, such as bronze when alloyed with tin, brass with zinc, and arsenical copper with arsenic (see Table 34 and text below). All these alloys have extremely good mechanical and working properties and have, therefore, been employed for applications requiring strength and hardness (West 1982). 

Figures 7.19a and 7.196 demonstrate how steel, brass, and copper increase in yield and tensile strength with increasing cold work. The price for this enhancement of hardness...

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