【摘要】 试验研究了860～980℃奥氏体化处理对30Cr3SiMnNiWMo钢（%:0.28C、0.74Mn、1.04Si、2.70Cr、1.15Ni、0.45Mo、1.04W、0.07V、0.05Al）组织以及260℃回火后钢的力学性能的影响。结果表明,30Cr3SiMnNiWMo钢860～920℃淬火组织中存在大量M₆C碳化物,对回火钢的韧性不利;950℃淬火后,钢中M₆C碳化物基本溶解,原奥氏体晶粒开始长大,回火后钢的强度降低;30Cr3SiMnNiWMo钢经920℃1h油淬+260℃2h回火可以获得具有少量残余奥氏体和未溶碳化物的板条马氏体组织,并具有优良的强韧性(R_m=1680 MPa,R_p0.2=1330 MPa,A=13%,Z=58.5%,A_KU=85 J)。更多还原

【Abstract】 The effect of austenitic treatment at 860～980℃on microstructure of steel 30CrSiMnNiWMo（%: 0.28C,0.74Mn,1.04Si,2.70Cr,1.15Ni,0.45Mo,1.04W,0.07V,0.05Al）and mechanical properties of steel tempered at 260℃has been studied.Results show that there are a lot of carbide M₆C in microstructure of steel 30Cr3SiMnNiWMo quenched at 860～920℃led to slightly decrease toughness of tempered steel,and after quenched at 950℃,the carbides in steel are basically dissolved and the original austenite grains of steel beginning coarsen led to decrease strength of tempered steel;with oil quenched at 920℃for 1 h+tempered at 260℃for 2 h,the steel 30Cr3SiMnNiWMo has lath martensite microstructure with minor residual austenite and un-dissolved carbides,so it has excellent strength and toughness i.e.UTS-1 680 MPa,YS-1 330 MPa,elongation-13%,RA-58.3%and impact energy-85 J.更多还原