回火温度对Q960级高强结构钢组织及力学性能的影响

 以屈服强度960MPa级高强调质结构钢板开发为目标，研究了在相同轧制及淬火条件下，回火温度对试验钢显微结构及力学性能的影响。结果表明：随回火温度的升高，试验钢强度下降，韧塑性总体上呈现升高趋势，其中在300~450℃范围内出现一个韧塑性能的恶化区。当回火温度为600℃时，试验钢呈回火索氏体组织，屈服强度为1030MPa，抗拉强度为1080MPa，伸长率为15.9%，-40℃冲击功达144J，各项指标均满足国标GB/T 16270—2009要求。并对试验钢的拉伸力学性能进行了探讨。

Effects of Tempering Temperature on Microstructure and Mechanical Properties for Q960 High-Strength Structural Steel Plates

To develop the Q960 high-strength quenched and tempered structural steel plates,the effects of tempering temperature on the microstructure and mechanical properties of plate specimens were investigated on the same rolling and quenching conditions.The results show that with the increase of tempering temperature,the strength values of specimens are reduced,and the toughness and ductility show a mainly increasing tendency.But the temper brittleness appears at 300-450 ℃.The excellent overall properties of specimens with tempered sorbite can be obtained when the tempering temperature is 600 ℃,i.e.,the yield strength is 1 030 MPa,tensile strength 1 080 MPa and percentage elongation 15.9% with the Charpy impact energy 144 J at-40 ℃.All these indexes come up to the National Standard GB/T 16270-2009.Then the tensile behavior of specimens was discussed.