采用双相区再加热-淬火-碳配分(IQ&P)工艺,研究初始组织为铁素体+珠光体的IQ&P-Ⅰ多相钢和初始组织为马氏体的IQ&P-Ⅱ多相钢的组织形貌、残留奥氏体及力学性能.结果表明:初始组织为铁素体+珠光体的IQ&P-Ⅰ多相钢室温组织中,铁素体和马氏体基本呈块状分布,块状残留奥氏体存在于铁素体与马氏体界面处,薄膜状只存在于马氏体内的板条之间,且残留奥氏体含量较少,TRIP效应不明显,其抗拉强度为957 MPa,伸长率只有20%,强塑积为19905.6MPa·%.初始组织为马氏体的IQ&P-Ⅱ多相钢中铁素体和马氏体大多呈灰黑色的板条状或针状,且细小的针状马氏体均匀地分布在铁素体基体上,残留奥氏体只以薄膜状平行分布在铁素体基体上,体积分数达到了13.2%,且具有较高的稳定性,TRIP效应较明显,强塑积达到21560MPa·%,可以获得强度和塑性的良好结合.
The microstructure ,retained austenite and mechanical property of low-carbon steels with different precursor microstructures were studied by means of intercritical reheating-quenching and par-titioning (IQ&P) processes .The results show that the structure of IQ&P-Ⅰ multiphase steel with precursor ferrite + pearlite (F+P) is blocky ferrite ,martensite (M ) .The blocky retained austenite (RA ) of IQ&P-Ⅰ multiphase steel exists in the boundary of ferrite and martensite and film-like re-tained austenite distributes around the lath martensite as the shape of thin slice .The transformation induced plastic effect of IQ&P-Ⅰ multiphase steel with less content of retained austenite is unappar-ent .The tensile strength of IQ&P-Ⅰ multiphase steel reaches 957MPa ,but the tensile elongation is only 20% ,and the production of strength and elongation is 19905 .6MPa ·% . The structure of IQ&P-Ⅱ multiphase steel with precursor martensite is needle or lath grey-black ferrite and martens-ite .The fine needle like martensite is distributed evenly on the ferrite matrix .The film-like retained austenite is only distributed on the ferrite matrix .The content of retained austenite of IQ&P-Ⅱ mul-tiphase steel reaches 13 .2% with more obvious TRIP effect and higher stability .The production of strength and elongation of IQ&P-Ⅱ multiphase steel is 21560MPa · % with good combination of strength and plasticity .
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