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1·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。

2·How to repair the cold die with quenching crack is badly needed in industrial productions.

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。

3·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。

4·Bearing parts in the process of hardening cooling by internal stress due to the formation of quenching cracks crack said.

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。

5·Several factors leading to quenching crack of dovetail cutters were analyzed. The heat treatment process was designed to prevent dovetail cutters from cracking.

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。

6·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。

7·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.

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。

8·The quenching distortion and crack of the gears were analyzed by means of metallograph and SEM.

通过金相检验和扫描电镜等检测手段对齿轮淬火畸变与开裂进行了分析。

9·After the heat treatment process was improved on, factors inducing part to crack were decreased, the quenching of part became easy to operate and the heat treatment quality of part was ensured.

对热处理工艺改进后，减少了诱发零件开裂的因素，降低了淬火操作的难度，保证了该零件的热处理质量。

10·The result indicated that crack was caused by lath-shape inclusion in the material and high quenching rate.

结果表明，由于材料中存在长条状夹杂物及淬火冷却速度过快导致螺母开裂。