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用自制热疲劳试验机,对经渗硼与未渗硼处理的钢结硬质合金GJW50的热疲劳性能进行了对比试验。结果表明,渗硼处理改变了这类材料的表面性质,从而延长了热疲劳裂纹萌生的孕育期,推迟了主裂纹形成的时间。但渗硼层的脆性及其孔洞的存在,使表面龟裂提前形成。减少渗硼层的孔洞,提高其韧性,可能是增强这类合金渗硼后热疲劳抗力的一条途径。
The self-made thermal fatigue testing machine was used to compare the thermal fatigue properties of GJW50 steel hardened with boronizing and non-boronizing. The results show that the boronizing treatment changes the surface properties of these materials, thereby prolonging the incubation period of thermal fatigue crack initiation and postponing the formation of the main crack. However, the brittleness of the boronizing layer and the existence of the holes make the surface cracks prematurely formed. Reducing the pores of the boronizing layer and increasing its toughness may be one way to enhance the thermal fatigue resistance of such alloy after boronizing.