【摘 要】
：
The effect of tempering temperature on the microstructure and mechanical properties of ultra-high strength, copper-bearing, low-carbon bainific steel has been i
【机 构】
：
School of Materials Science and Engineering,Hubei Province Key Laboratory of Ceramics and Refractori
论文部分内容阅读
The effect of tempering temperature on the microstructure and mechanical properties of ultra-high strength, copper-bearing, low-carbon bainific steel has been investigated in the experiment. The results showed that the microstructure was mainly the laths of bainite in the as-quenched steel. The bainitic laths were restored arid combined after the steel tempered at various tempera-tures. There were martensite/austenite (M/A) islands and numerous dislocations within and between the bainitic laths, while very free precipitates of ?Cu were also observed within the laths. With increasing the tempered temperature from 400 to 600℃, the yield strength (YS) increased from 877 to 957 MPa, whereas the ultimate tensile strength (UTS) decreased from 1020 to 985 MPa. The Charpy V-notch (CVN) varied from 68.5 to 42 J, and the value was minimal for the steel tempered at 500~C.
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