CAJ | 학술논문

研究了不同硅含量(0.7 %～2.4 %，质量分数，下同)贝氏体铸钢的抗高应力磨损性能和失效机制。结果表明：高硅贝氏体铸钢的耐磨性能较低硅钢显著提高，其磨损失重约是低硅贝氏体铸钢的1/2。这是因为硅使贝氏体铸钢在高应力冲击磨损下表现出不同的失效机制。低硅(0.7 %)贝氏体铸钢由于韧性低、组织结构粗大及树枝晶的微区成分偏析，故材料抵抗冲击的能力很低，常在表面还未形成强烈变形层(白层)甚至变形层时，就在变形层和材料基体内产生裂纹并扩展，故低硅贝氏体铸钢的失效方式为变形层和基体剥落机制。而硅含量为1.6 %～2.4 %的高硅贝氏体铸钢，因脆性的渗碳体被韧性的残余奥氏体所代替，钢的韧性显著提高，失效方式表现为白层的剥落机制。
연구료불동규함량(0.7 %～2.4 %，질량분수，하 동)패씨체주강적항고응력마손성능화실효궤제。결과표명：고규패씨체주강적내마성능교 저규강현저제고，기마손실중약시저규패씨체주강적1/2。저시인위규사패씨체주강재고응 력충격마손하표현출불동적실효궤제。저규(0.7 %)패씨체주강유우인성저、조직결구조대 급수지정적미구성분편석，고재료저항충격적능력흔저，상재표면환미형성강렬변형층(백 층)심지변형층시，취재변형층화재료기체내산생렬문병확전，고저규패씨체주강적실효방 식위변형층화기체박락궤제。이규함량위1.6 %～2.4 %적고규패씨체주강，인취성적삼탄체 피인성적잔여오씨체소대체，강적인성현저제고，실효방식표현위백층적박락궤제。
The high stress-wear resistance and mechanism for bainitic cast steels with different Si content (0.7 %～2.4 %) have been studied systematically.The experiments have shown that the wear loss of high Si bainitic cast steels is only about 1/2 times as that of low Si baini tic cast steels, showing better wear resistance of the former under high stress impact.The reason is that the impact wear mechanism is different for low and hi gh Si bainitic cast steels.Low Si bainitic cast steel has poor wear resistance under high stress impact because of its low toughness, coarse dendrite and micro -segregation, etc.So the damage cracks are easily formed in the wear surface b efore formation of white layer, and propagate inside the deformation zone and ma trix, exhibiting mechanism of deformation zone and matrix delamination.The imp act toughness of high Si bainitic cast steels are improved apparently for the re ason that the brittle cementite is replaced by ductile retained austentite film, resulting in the brittle delamination of white layer.