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| Microstructure Characteristic and Mechanical Properties of X100 Pipeline Steel in Different Cooling Schedules |
| ZHOU Min |
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Abstract A lab designed pipeline steel was used to study the continuous cooling transformation (CCT) and the microstructure characteristic and mechanical properties in different cooling schedules. It was shown that with cooling rate increasing and finish cooling temperature decreasing, the microstructure evolved from acicular ferrite to lath bainite and martensite, martensite islands or M-A islands were micro-twining martensite in non-quenched steel, the comprehensive mechanical properties was the optimum in the steel that cooled to about 450℃ at the rate of about 30℃/s without relaxation. When relaxation and super-fast cooling process is used, it is essential to well control the relaxation time and finish cooling temperature of super-fast cooling process and combine with the following cooling process for obtaining the perfect microstructure and strength and toughness.
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Received: 15 March 2010
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2011, Vol. 46 
