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研究一系列经正火和时效热处理的Mn-Mo-Nb-V微合金铸钢件以满足需要有韧性、强度和可焊性的零件的要求。达到了预定的目标,即采用除含有0.10％-O.006％N,微量Nb、V外,尚含1.65％Mn、0.4％Mo的合金,在38毫米厚的平板铸件上实现美国铁路协会(AAR)规定的C级淬火和回火铸钢件性能的要求。这种材料经正火和时效生成细小的多角形铁素体组织,性能为:HBl92,屈服强度460兆帕,延伸率29％,断面收缩率67％,-40℃冲击能力为39J。多次正火和时效能在保持高韧性条件下进一步细化晶粒和提高硬度。
A series of Mn-Mo-Nb-V microalloyed castings treated with normalizing and aging heat treatments were studied to meet the requirements of parts requiring toughness, strength and weldability. The intended goal was achieved by using an alloy containing 1.65% Mn and 0.4% Mo in addition to 0.10% -0.006% N, trace amounts of Nb and V to achieve the American Railway Society AAR) C-level quenching and tempering steel casting performance requirements. This material generates fine polygonal ferrite by normalizing and aging, with properties of HBl92, yield strength of 460 MPa, elongation of 29%, reduction of area of 67% and impact resistance of 40 J at 39 ° C. Multiple normalizing and aging can further refine grains and increase hardness while maintaining high toughness.