【摘要】 利用SEM,EDS和DSC研究回火温度及预热对高电阻率高导磁1Cr17N i2S i2双相不锈钢组织与力学性能的影响。结果表明,1Cr17N i2S i2双相不锈钢淬火+低温回火处理后的组织为回火马氏体+δ-铁素体+少量碳化物,随着回火温度的升高,回火马氏体分解的碳化物弥散析出,抗拉强度和冲击韧性下降;经850℃预热处理1 h可以使更多碳化物溶于基体,避免其在晶界析出且回火冷却后得到更多马氏体,比未预热获得更高的冲击韧性和强度。1Cr17N i2S i2双相不锈钢优化后的热处理工艺为:850℃×1 h预热+1050℃×2 h淬火,油冷+340℃×2 h回火,空冷。更多还原

【Abstract】 The effect of tempering temperature and preheating on microstructure and mechanical properties of a high resistivity and magnentic permeability duplex stainless steel 1Cr17Ni2Si2 was studied by SEM,EDS and DSC.The results show that the microstructure of 1Cr17Ni2Si2 steel after quenching and low temperature tempering is tempering martensite,δ-ferrite and a small mount of carbide.With tempering temperature increasing,it results in the dispersed precipitation of the carbides which tempering martensite disassembles into.So the tensile strength and impact toughness decrease.After preheating at 850 ℃ for 1 h,much more carbides can dissolve in matrix,and not precipitate at grain boundary,and more martensite can be obtained after tempering cooling.Then higher impact toughness and strength are obtained than that without preheating in the steel.Final optimal heat treatment is preheating at 850 ℃ for 1 h,austenitizing at 1050 ℃ for 2 h,cooling in oil and tempering at 340 ℃ for 2 h,cooling in air.更多还原