论文部分内容阅读
通过滚-滑式接触疲劳试验,对若干种堆焊合金的抗接触疲劳性能进行了对比,筛选出了一种新型的堆焊合金。该合金具有较为理想的接触疲劳抗力。当赫兹接触应力σ_j=1560MPa时,寿命可达10~7以上。同时,对该合金优良的接触疲劳抗力的来源进行了探讨。认为在变形过程中发生的r→a’应变诱发马氏体相变和M_3C颗粒的析出有效地提高了材料的强度,阻止了持续的塑性变形。而应变诱发马氏体周围的奥氏体则具有很大的韧性储备,可以降低裂纹的扩展速率,从而提高了使用寿命。这一合金的特点在于,材料的强度来自使用初期的跑合过程,省去了堆焊后对表面的热处理工艺。
Through the rolling - sliding contact fatigue test, the contact fatigue properties of several surfacing alloys were compared, and a new type of surfacing alloy was screened out. The alloy has a more ideal contact fatigue resistance. When Hertz contact stress σ_j = 1560MPa, the life expectancy of up to 10 to 7 or more. At the same time, the source of contact fatigue resistance of the alloy was discussed. It is considered that the transformation of r → a ’induced martensitic transformation and the precipitation of M_3C particles during the deformation process effectively improve the strength of the material and prevent the continuous plastic deformation. The austenite around strain-induced martensite has a great toughness reserves, can reduce the rate of crack growth, thereby increasing the service life. This alloy is characterized by the strength of the material from the initial run-in process, eliminating the need for surface heat treatment after surfacing process.