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It is found that mesoscale lows occur often on Meiyu (Baiu) front in Summer. There is close rela-tionship between the low system and heavy rainfall. A typical case from 21 to 22 jUNE 1986 has beenanalyzed. The conclusions are as follows: (1) Meiyu front is located in a banded zone of positivevorticity. The mesoscale low develops near the maxima of convergence of moisture flux. (2) The verticalcross sections of M and show that conditional symmetrical stabi1ity is a possible triggering mecha-nism for the occurrence...

It is found that mesoscale lows occur often on Meiyu (Baiu) front in Summer. There is close rela-tionship between the low system and heavy rainfall. A typical case from 21 to 22 jUNE 1986 has beenanalyzed. The conclusions are as follows: (1) Meiyu front is located in a banded zone of positivevorticity. The mesoscale low develops near the maxima of convergence of moisture flux. (2) The verticalcross sections of M and show that conditional symmetrical stabi1ity is a possible triggering mecha-nism for the occurrence of heavy rainfall on the Meiyu front. (3) Three dimensional trajectory analysisof air parcels show clearly that confluence of the two different nows coming from upper and lowerlevels, respectively, was very significant and result in very strong divergence in upper levels. Themesoscale low systems formed in this favourable environment of middle reaches of the Yangtze River.

本文对1986年6月22日出现于长江中游的一次中低压过程进行了诊断分析。这个中低压水平尺度约500km,生命史为一天,但是形成了日降水量263mm的特大暴雨。分析揭示,梅雨锋是一条近于东西走向的正涡度带状分布区。而这一带状区中存在强烈的中尺度水汽通量辐合中心和深厚的上升运动区,有利于中尺度低压的形成。M和θ的剖面表明,条件对称不稳定(CSI)可能是这次梅雨锋暴雨的一种触发机制。此外,由拉格朗目方法对气块三维轨迹的计算表明,来自高低空和不同方向的两支大尺度气流的结合使高空辐散加强,可能对中低压的发展有帮助。

This paper introduces the failure analysis of Cr12MoV steel cold-blanking die, forging and the improvement measure of heat treatment process. Cr12MoV steel is a cold work die steel with high carbon and high chromium.After being forged repeatedly annealing structure contains a large number of coarse carbide withdistributed inhomegeneity. At the same time, carbide can't be dissolved in austenite formed brittleness. Carbide stringers distribution exist in microstructure as the result of the effect of...

This paper introduces the failure analysis of Cr12MoV steel cold-blanking die, forging and the improvement measure of heat treatment process. Cr12MoV steel is a cold work die steel with high carbon and high chromium.After being forged repeatedly annealing structure contains a large number of coarse carbide withdistributed inhomegeneity. At the same time, carbide can't be dissolved in austenite formed brittleness. Carbide stringers distribution exist in microstructure as the result of the effect of heat treatment process. However, we can achieve satisfactory properties through the improved forgingd and heat treatment process which can make the micro-tissue well-distributed and meet the demand of design.

介绍了Crl2MoV钢冷冲裁模的失效分析以及锻造、热处理工艺的改进措施.Crl2MoV钢是一种高碳高铬的冷作模具钢,退火组织中含有数量较多的、粗大的碳化物,虽然经过反复锻造,但碳化物的分布仍不均匀;同时,由于热处理工艺的影响,使奥氏体中存在部分未溶的碳化物,在金相显微组织中形成了脆性的碳化物带状分布区.经改进锻造和热处理工艺后,使显微组织均匀化,获得了满意的力学性能,达到了设计寿命的要求.

 
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