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采用γ单相区和γ+α双相区轧制并淬火工艺以及双相区再加热-淬火-碳配分(IQ&P)工艺,研究预处理组织对低碳钢室温状态多相组织特征及力学性能的影响规律.实验用低碳钢经两种工艺轧制并淬火处理,获得马氏体和马氏体+铁素体的预处理组织,再经双相区IQ&P工艺处理后均获得多相组织.马氏体预处理钢的室温组织由板条状亚温铁素体、块状回火马氏体以及一定比例的针状未回火马氏体和8.2%的针状残余奥氏体组成;马氏体+铁素体预处理钢由板条状亚温铁素体、块状和针状未回火马氏体以及14.3%的短针状或块状残余奥氏体组成.在相同的双相区IQ&P工艺参数下,预处理组织为马氏体的钢抗拉强度为770 MPa,伸长率为28%,其强塑积为21560 MPa·%;而预处理组织为马氏体+铁素体的钢抗拉强度为834 MPa,伸长率增大到36.2%,强塑积达到30190 MPa·%,获得强度与塑性的优良结合.
The characteristics of pre-treatment microstructure and mechanical properties of low-carbon steel at room temperature were studied by means of γ & α dual-phase rolling and quenching process and dual-phase reheating-quenching-carbon partitioning (IQ & P) The experimental results show that the low carbon steels are rolled and quenched by two kinds of techniques, and the pretreated microstructure of martensite and martensite + ferrite is obtained. The martensite pretreated steel consisted of lamellar sub-ferrite, massive tempered martensite and a certain proportion of acicular untempered martensite and 8.2% acicular retained austenite. The austenitic + ferritic pretreated steels consisted of lamellar sub-ferrite, massive and acicular untempered martensite, and 14.3% of short acicular or massive retained austenite. In the same dual phase zone Under the conditions of IQ & P, the tensile strength of martensitic steel pretreated with martensite is 770 MPa, the elongation is 28%, and the strong plastic product is 21560 MPa ·%. The pretreated microstructure is martensite + ferrite The tensile strength of steel is 834 MPa, the elongation increases to 36.2% and the strong plastic product reaches 30190 MPa ·%, obtaining the excellent combination of strength and plasticity.