【摘要】：以自主設(shè)計的稀土改性Si-Mn-B系貝氏體-馬氏體復(fù)相耐磨鋼為研究對象,利用正交試驗研究了不同淬火溫度、淬火保溫時間、回火溫度、回火時間對材料強度、沖擊功的影響,以確定最佳熱處理工藝,并利用XRD、OM、SEM、TEM方法對其最佳熱處理工藝組織進(jìn)行分析。結(jié)果表明:淬火溫度對抗拉強度影響最大,回火溫度對屈服強度的影響最大,淬火保溫時間對沖擊功的影響最大。最優(yōu)熱處理方案為:900℃×1.5 h油淬+300℃×3 h回火處理。按此方案熱處理后有較好的強韌配合:抗拉強度為1903 MPa,屈服強度為1591 MPa,洛氏硬度為51.4 HRC,無缺口沖擊功為267 J。采用彩色金相-化學(xué)腐蝕法,組織為下貝氏體(49.6%)、板條馬氏體(43.9%)和少量殘留奧氏體(6.5%)。
[Abstract]:The effects of quenching temperature, holding time, tempering temperature and tempering time on the strength and impact work of Si-Mn-B modified bainitic martensite wear resistant steel were studied by orthogonal test. In order to determine the optimum heat treatment process, the structure of the optimum heat treatment process was analyzed by means of XRDX OMU SEMX TEM method. The results show that quenching temperature has the greatest influence on tensile strength, tempering temperature on yield strength and quenching time on impact work. The optimal heat treatment scheme is oil quenching at 900 鈩，

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