Low alloy cold die steel belongs to high carbon steel, so the quenching crack is easy to appear when it is hardened. 低合金冷作模具钢多属于高碳钢,淬火中易出现淬火裂纹。
Quenching crack deep and long, straight fracture, fracture surface without oxide color. 淬火裂纹深而细长,断口平直,破断面无氧化色。
Quenching crack propagation characteristics of the organizations on both sides without decarburization phenomenon significant difference between crack and materials and forging cracks. 淬火裂纹的组织特征是裂纹两侧无脱碳现象,明显区别与锻造裂纹和材料裂纹。
The results have shown that tensile straightening between quenching and ageing has no effect on the crack propagation rate and fracture toughness, but has some effect on tensile properties of the sheet. 结果表明,淬火与时效间的板材拉伸矫直对裂纹扩展速率及断裂韧性无影响,而对力学性能有影响。
Quenching crack did not occur any more due to the new process and the die life was greatly extended. 采用该工艺再没有出现淬火裂纹事故,模具使用寿命大为提高。
The results showed that the severe banded structure segregation and uneven microstructure existing in the steel of the gears was the main reason to cause the quenching distortion and crack of the gears, and the hydrogen diffused in the drive gear induced the crack to expand quickly. 结果表明,齿轮材料中带状组织严重偏析和金相组织不均匀是导致齿轮产生淬火畸变与开裂的主要原因。同时,主动齿轮材料中渗入的氢加速了裂纹的扩展。
Because of super rapid heating and cooling while pulse current is switched on, the super high speed impact quenching is accomplished around crack tip. 由于裂尖附近超快速加热和冷却,金属材料完成了一次超高速冲击淬火。
It is showed that: 1. The quenching temperature, or the tempering temperature, or thc mechanism of crack propagation, or the size of carbide particals, or the depth of hardening effects to the rate of crack propagation da/ dN. 实验结果表明:1.淬火温度、回火温度、疲劳裂纹扩展机制、二次碳化物的尺寸、试样的淬硬深度等因素均影响疲劳裂纹扩展速率。
This thesis is directed to key problems of laser quenching hardened depth and laser cladding layer crack control based on gear laser quenching and laser cladding. 本文以齿轮表面激光淬火和激光熔覆为研究内容,重点对齿轮激光淬火硬化层性能与层深,以及齿轮激光熔覆工艺与裂纹控制等关键技术问题进行研究。
Induced quenching crack of big dozer gear 大功率推土机齿轮感应淬火裂纹的探讨
Quenching Crack Analysis and Prevention Measures of Tap Shank 丝锥柄部淬火开裂分析及防止措施
After the ring gear is jet quenched by using PAG aqueous soluble polymer and the test for both heat process and polymer concentration are made, the specification of the ring gear is satisfied and quenching crack is eliminated. 后采用PAG水溶性聚合物喷淬,并进行了加热工艺和聚合物浓度方面的试验,既达到了齿圈的技术要求,又消除了淬火裂纹。
There are two kinds of the medium frequency quenching crack for the crankshaft, namely, cracks in both oil hole and neck surface. 曲轴中频淬火裂纹有油孔裂纹和轴颈表面裂纹两种。
On condition that the sprocket ′ s hardness and effective hardening case depth meets the technical requirements, UCON A quenchant can minimize the PM sprocket ′ s induction quenching stress, and hence control the quenching crack rate within 1%. 在链轮硬度与有效硬化层深度达到技术要求的情况下,UCONA型水溶性淬火介质使铁基粉末冶金链轮感应淬火冷却时的应力降到最小,从而把淬火开裂比例控制在1%以内。
The effect of quenching temperatures on the rate of stress corrosion crack propagation of4330M steel in distilled water has been investigated. 本文研究了淬火温度对4330M钢在蒸馏水中的应力腐蚀裂纹扩展速率的影响。
The fracture is brittleness cleavage one because that mechanical property of axle is disqualification and quenching crack presence on the surface by the surface treatment. 加之轴表面存在划痕,在表面淬火后形成淬火裂纹,在使用过程中发生脆性解理断裂。
The equilibrium phase particles that induce the sensitivity of the quenching are not the direct reason that causes the alloy fracture; the microzone of PFZ around particles limits crack extension and coordinates deformation, this causes the formation of the ductile tension fracture. 引起淬火敏感性的平衡相粒子,不是造成合金断裂的直接原因,粒子周围的无析出微区起到了限制裂纹扩展和协调变形的作用,是合金形成延性拉伸断口的原因。
The cold die with a large dimension 、 complicated structure and high precision will soon have to be scrapped because of there exists the quenching crack in it. 对于尺寸较大、形状复杂、加工精度高的冷作模具,因出现淬火裂纹而报废,损失是十分惨重的。
The super high speed impact quenching was studied with experiment of crack arresting through pulse current discharge. 通过脉冲放电止裂试验研究了裂尖超高速淬火全过程。
Lapping Repair for Quenching Crack inside a Cold Die Steel 冷作模具钢淬火裂纹的搭桥修复
Precaution of Quenching Crack of Dovetail Cutter 预防鸽尾铣刀淬火裂纹的工艺探索
According to the classical heat conduction equations, establish quasi-static stress model of quenching process. Then thermal shock model considering dynamical behavior and crack propagation model were established. 根据经典热传导方程,建立淬火过程准静态热应力模型,同时考虑应变速率对热冲击过程中热应力的影响,建立淬火动态热应力模型。