| 1. | Note : transverse impact energy requirements are shown in brackets
注：括号内为横向冲击功要求。 |
| 2. | A discussion on the relationship between dynamic fracture toughness and impact toughness
动态断裂韧度与冲击功之间关系的探讨 |
| 3. | At the same time , isothermal aging and impact testing are used to study the variations of impact energy ak with aging time of the sn - doped steel
同时，采用等温时效和冲击等试验方法研究了含sn低碳钢在保温过程中冲击功a _ k随时间的变化规律。 |
| 4. | During isothermal aging , impact energy rapidly decreases and embrittlement rapidly increases with increasing aging time . when the aging time reaches 120 seconds , the minimum impact energy is obtained where the embrittlement attains the largest
等温时效初期，随着时间的延长，冲击功迅速下降，在120秒左右时，出现最低值，当时间进一步延长，冲击功缓慢上升。 |
| 5. | Aided by impact experiment and fracture analysis , it finds that the impact power of the steels decreases significantly as the nitrogen content increases from 81 10 ^ ( - 6 ) to 98 10 ^ ( - 6 ) , and the drop is the greatest at - 40 ~ - 60
通过冲击试验性能数据和断口形貌分析发现，当试验钢含氮量从81 10 ^ ( - 6 )增加到98 10 ^ ( - 6 )时，试验钢的冲击功大幅度地下降，在- 40 ~ - 60区间上冲击功下降幅度最大。 |
| 6. | The ratios of charpy impact value of small size specimen to that of the standard are studied by using the series charpy v - notch impact test method and the question how to select equivalent ratio of the charpy impact quota of non standard sample is also discussed
通过夏比v型缺口冲击试验，研究了结构钢小尺寸试样的冲击功与标准试样冲击功的比值在系列温度冲击试验中的变化规律，并述评了用等效比值数确定小尺寸试样冲击功指标的问题。 |
| 7. | As the aging time increases further , the impact energy is gradually increased and the embrittlement is gradually improved . changing of impact energy with time responses of the kinetics of non - equilibrium segregation , so the time at which the impact energy is minimum is measured as the critical time . as measure in this experiment the critical time of sn non - equilibrium segregation is 120 seconds at 750
冲击功随保温时间的变化反映了sn的非平衡品界偏聚动力学过程，因此把冲击功达到最小值时的保温时’间作为s ， 1发生非平衡晶界偏聚的临界时间，本试验测出sn在0 ， 15wt . % c钢中750保温时发生非平衡晶界偏聚的临界时间为1205左右。 |
| 8. | Especially for the longitudinal heat checking of tool joint , the hoop toughness criterion of tool joint material was put forward to prevent the heat checking . based on analysis for field failure cases , minimal hoop impact work by means of mechanical calculation has been obtained , which can be used to modify the relevant contents of api rp7g
特别针对钻杆接头纵向热裂问题，提出了控制接头材料的横向韧性判据，并以现场失效案例分析为基础，经力学计算初步确定了最低横向冲击功要求，可用于完善修订apirp7g推荐做法的有关内容。 |
