用TEM观察了共析珠光体钢经真应变为2.89的拉拔变形以及不同温度时效后微观组织的变化,测量了时效温度对力学性能的影响.结果表明,大变形珠光体钢在473 K时效后获得相对于时效前(σb=2061 MPa)更高的抗拉强度(σb=2300 MPa),在673 K时效获得较均衡的强韧性能(σb=1856 MPa,δ=3.7%).组织观察发现,大变形中溶解的渗碳体在时效过程中弥散析出,分析认为碳化物的析出阻碍位错运动,提高了该钢的力学性能.
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