第一类热处理缺陷指淬火裂纹。
First kind refers to hardening heat treatment defects cracks, or quenching cracks.
淬火裂纹深而细长，断口平直，破断面。
Quenching crack deep and long, straight fracture, fracture surface without oxide color.
低合金冷作模具钢多属于高碳钢，淬火中易出现淬火裂纹。
Low alloy cold die steel belongs to high carbon steel, so the quenching crack is easy to appear when it is hardened.
金属材料工件因淬火裂纹造成产品或原材料报废的实例很多。
There are many scrapped products or raw materials caused by the quench cracks of metal workpieces.
轴承零件在淬火冷却过程中因内应力所形成的裂纹称淬火裂纹。
Bearing parts in the process of hardening cooling by internal stress due to the formation of quenching cracks crack said.
如何修复已出现淬火裂纹的模具，是工业生产中急需解决的问题。
How to repair the cold die with quenching crack is badly needed in industrial productions.
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。
Quenching crack propagation characteristics of the organizations on both sides without decarburization phenomenon significant difference between crack and materials and forging cracks.
在分析原生产工艺产生裂纹的原因后，得出了扳手裂纹主要系淬火裂纹和磨削裂纹的结论。
Based on the investigation of craze induced in previous production technique, a conclusion is obtained that the wrench craze mainly consists of quenching flaws and grinding cracks.
分析了导致鸽尾铣刀产生淬火裂纹的因素，设计了能有效预防鸽尾铣刀淬裂的热处理工艺。
Several factors leading to quenching crack of dovetail cutters were analyzed. The heat treatment process was designed to prevent dovetail cutters from cracking.
总之，造成淬火裂纹的原因可能是上述因素的一种或多种，内应力的存在是形成淬火裂纹的主要原因。
In short, the causes of cracks caused by hardening of these factors may be one or more, the existence of internal stress is the main reason for the formation of quenching cracks.
基于两种机制的提出，可以较好地说明影响淬火裂纹形成的主要原因是氧的污染和不适宜的淬火冷却速度。
The major reason of the formation of quench cracks is the contamination of oxygen in the early processing or unsuitable quench cooling rate during heat treatment.
结果表明，淬火过热和磨削加工不当，致使零件中形成了许多淬火裂纹和磨削裂纹，最终导致动凸轮断裂。
It was concluded that over heated quenching and improper grinding caused quenching and grinding cracks, leading to fracture failure of translation CAM.
淬火裂纹：裂纹在钢材的淬火或淬火后形成，由于冷却时的高应力所造成；也有可能是在淬火油中的水所导致。
Quench Cracks: Cracks formed in a steel part during or after quench, resulting from high stresses in cooling; could be caused by water in the quench oil.
结果表明：螺钉发生断裂是由于热处理不当引起的淬火裂纹扩展所致，并提供有效的改进措施，解决了螺钉断裂问题。
The results show that the screw breakage is due to quenching crack from improper heat treatment. The effective improvement measures to solve the problem of screw breakage are provided.
从淬火裂纹的特征、起因、影响因素入手，对金属材料热处理工件淬火裂纹问题进行了探讨，并提出防止裂纹产生的措施。
This paper makes an inquiry into the problem, proceeding form the characteristics, cause and effect of the quench cracks, and proposes som measures to prevent cracks.
大模数重载汽车主减速器盆形齿轮经渗碳淬火后，齿轮齿面经常会出现裂纹。
Cracks frequently generated in basin gear of big modulus main reducer used in heavy load truck after carbonizing and quenching.
采用化学分析、金相检验和显微硬度梯度试验等方法对油压机柱塞表面淬火交界处裂纹进行了分析。
The crack in quenching boundary of the hydraulic press plunger surface was analyzed by means of chemical composition analysis, microstructure examination and microhardness testing.
分析结果表明，在H13钢淬火过程中，操作不当是使加厚模产生裂纹的主要因素。
The results shows that during the quenching process of H13 steel, the improper operation is the main factor to produce the cracks on the thicker mould.
此外，还定性分析了淬火、回火后残余应力的性质及热处理工艺过程对裂纹形成的影响。
In additions the paper qualitatively analyses the influence of residual stresses occurring after quenching and tempering and the process of heat treatment on the formation of the cracks.
本文对淬火加回火渗碳钢的拉伸一拉伸疲劳断口进行了内裂纹的分析和研究。
Internal fatigue cracks occurred in the fracture of a quenched and tempered carburized steel specimen under tension-tension fatigue loads are discussed in this paper.
结果表明，尖角效应引起的应力集中和热处理淬火加热温度偏高是导轨端面产生裂纹的主要原因。
The results show the stress concentration caused by acute angle effect and the high temperature are the primary cause of producing crack.
无论是淬火或淬回火态的试样其热疲劳裂纹主要沿着碳化物与基体脱开处及晶界裂纹桥接而扩展。
The thermal fatigue crack propagated mainly through the break-age of the interface of carbide and grain boundaries for either quenched or quenched and tempered steel.
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 effect of quenching temperatures on the rate of stress corrosion crack propagation of 4330M steel in distilled water has been investigated.
对球墨铸铁中频淬火凸轮轴磨削裂纹产生的原因进行了分析。
The cause of the grinding crack on medium frequency induction hardened CAM shaft made of spheroidal cast iron was analyzed.
淬火组织中马氏体与残余奥氏体的成分不均匀及磨削用量参数选择不当是导致裂纹出现的主要原因。
Uneven components of quenched martensite and residual austenite structure and improper grinding parameter are attributed to the main causes for cracks.
经热处理淬火的碳素工具钢和渗碳淬火钢零件，在磨削时常常出现大量较规则排列的裂纹，它直接影响零件的质量。
The parts of tool steel and carburization hardened steel through he at treatment has often appeared grinding cracks. It influences the quality of the parts.
垂直于轴线的裂纹是因为淬火快速冷却时。厚壁处未淬透以及截面尺寸突变产生的弧形裂纹。
Crack perpendicular to the axis is caused on too rapid quench cooling, non-hardenability of the thick-walled department, as well as mutation of cross-section size. This is a typical arc-shaped crack.
垂直于轴线的裂纹是因为淬火快速冷却时。厚壁处未淬透以及截面尺寸突变产生的弧形裂纹。
Crack perpendicular to the axis is caused on too rapid quench cooling, non-hardenability of the thick-walled department, as well as mutation of cross-section size. This is a typical arc-shaped crack.
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