模拟焊后热处理次数对Q370R钢板的性能影响研究

主要研究Q370R正火板经过不同次数的模拟焊后热处理后的性能变化情况,并分析了引起变化的原因。研究表明:随着模拟焊后次数增加,无论钢板厚度1/4处还是1/2处的屈服强度和抗拉强度均出现下降趋势,对于0℃和-20℃横向冲击,厚度1/2处呈下降趋势,厚度1/4处呈上升趋势;对于-40℃横向冲击,厚度1/4处和1/2处均下降。     

模拟焊后热处理次数对Q345R钢板力学性能的影响

针对不同次数模拟焊后热处理对Q345R正火状态钢板力学性能的影响进行了研究.结果表明,随着模拟焊后次数增加,钢板厚度1/4处和1/2处的屈服强度和抗拉强度均出现下降趋势,钢板厚度1/4处和1/2处的-60℃～0℃系列横向冲击性能均有所降低.     

中低温压力容器用钢SA516Gr70模拟焊后热处理研究

研究了鞍钢中低温压力容器用SA516Gr70钢板经不同温度模拟焊后热处理后的组织、性能变化情况。研究表明鞍钢开发的SA516Gr70钢板随着模拟焊后热处理温度升高,强度呈下降趋势而韧性基本不变,组织形态未发生变化,仍为珠光体＋铁素体组织,强度下降的主要原因是由于模拟焊后热处理后位错密度降低明显,但强度下降后仍能够满足标准要求,其原因在于钢中第二相粒子在整个过程中仍然起着弥散强化的作用。     

模拟焊后热处理制度对09MnNiDR钢板组织及性能的影响

针对模拟焊后热处理工艺对09MnNiDR钢板组织和性能的影响展开试验研究,结果表明：随着模拟焊后热处理时间的延长以及温度的升高,钢板组织内析出的碳化物逐渐增多,但并未发生明显的聚集长大,钢板的屈服强度、抗拉强度均有不同程度降低,而延伸率、冲击韧性则有所提升,但并不呈单一变化。     

热处理对15CrMoR特厚钢板组织和力学性能影响研究

研究了不同回火温度及模拟焊后热处理制度对15CrMoR特厚钢板组织和力学性能的影响。结果表明:随着回火温度的增加,钢板的强度降低,塑性升高;模拟焊后热处理态强度与回火态相比进一步降低,冲击韧性呈现相同趋势,而基体组织的晶粒度并未发生明显变化,析出相明显增多,析出相向晶界处聚集长大,导致钢板性能发生变化。     

模拟焊后热处理制度对临氢12Cr2Mo1R钢板性能的影响

介绍了模拟焊后热处理制度对临氢12Cr2Mo1R钢板性能的影响,结果表明：相同的模拟焊后温度下,随着模拟焊后时间的延长,钢板的强度降低,延伸率升高,模拟焊后时间的延长对钢板的冲击性能、晶粒度、显微组织影响不大。     

封头热成型及热处理对SA537CL.1钢板组织与性能影响

根据热成型封头加工过程温度的变化规律,进行了模拟热成型工艺对50 mmSA537CL.1正火钢板组织与性能影响的试验。结果表明：正火钢板经模拟成型和恢复性能热处理后,强度下降20 MPa左右,塑性和韧性变化不大;经620℃模拟焊后热处理,钢板强度下降10 MPa左右,冲击韧性下降25%左右,且随焊后热处理时间的延长,强韧性进一步下降;钢板组织为铁素体+珠光体,晶粒度9级,力学性能优良,可以用于制造热成型封头产品。     

模拟焊后热处理工艺对13MnNiMoR钢板组织和性能的影响

分析模拟焊后热处理工艺对压力容器用高性能13MnNiMoR钢板组织和性能的影响,结果表明:钢板经模拟焊后热处理,抗拉强度降低,Z向性能改善;温度相同,随着保温时间的延长,抗拉强度降低且趋稳,延伸率逐渐降低;时间相同,随着保温温度的升高,屈服强度和Z向值降低;随着温度提高或保温时间延长,晶粒尺寸增大并趋向均匀。试板经过模拟焊后热处理,钢板力学性能满足标准要求。     

新型Ti-3Al-2Mo-2Zr(TA24)合金焊接及热处理工艺研究

根据新型钛合金Ti-3Al-2Mo-2Zr(TA24)化学成分、组织、性能特点,研究了材料典型温度高温性能,采用GTAW焊接中厚新型钛合金试板,在焊接接头无损检测后,在规定温度下执行焊后热处理,制备试样进行力学性能和金相等试验,分析新型钛合金焊接性及不同焊后热处理温度接头性能变化。结果表明新型钛合金具有良好焊接性和耐高温性能,650～750℃是该新型合金焊后热处理适宜温度。     

模拟焊后热处理制度对09MnNiDR钢板强韧性能的影响

分析模拟焊后热处理工艺对压力容器用高性能09MnNiDR钢板性能的影响,结果表明钢板随着模拟焊后热处理保温时间的延长,晶内析出的碳化物增多,钢板强度略微下降,延伸率有所升高,但是对-70～-80℃温度下的冲击韧性影响甚微;随着模拟焊后热处理温度的提高,组织中粒状贝氏体量明显增多,已进入两相区,造成强度偏高韧性大幅度降低。     

焊后热处理对07MnCrMoVR钢热影响粗晶区-20℃冲击韧性的影响

采用光学显微镜、扫描显微镜、透射电镜和冲击韧性试验机对07MnCrMoVR钢热影响粗晶区在460～660℃ 2h焊后热处理工艺下的组织性能进行了分析。结果表明,随着焊后热处理温度的升高,焊缝热影响粗晶区-20℃冲击韧性呈现先降低再升高的现象。焊后热处理钢在580℃和620℃出现再热裂纹倾向,冲击试样为脆性断口,解理断裂,沿着晶界出现了微裂纹,主要是因为碳化物沿着晶界析出并长大弱化了晶界的结合能,导致低温冲击韧性出现降低。≥620℃焊后热处理,07MnCrMoVR钢出现再结晶的现象,位错消失,铁素体晶粒合并长大使其低温冲击韧性又重新升高。该钢最优焊后热处理为460～500℃ 2 h。     

锅炉及压力容器用SA—302Gr.C特厚钢板的研制

本文对ＳＡ－３０２Ｇｒ．Ｃ钢冶炼成分选定，生产工艺，性能检验，气体夹杂物检验，钢的高温拉伸性能，钢的模拟焊后热处理性能，钢板系列冲击试验等做了较全面的研究与分析，并克服了生产该钢的难点，探讨出比较合理的生产工艺。     

Influence of post-weld heat treatment on the microstructure and hardness of laser weld seams on hot-rolled TRIP 800 steel

The transformation induced plasticity (TRIP) steels effect occurs because of the martensitic transformation of retained austenite during plastic deformation,and it provides the steel with excellent strength and ductility.While welding remains a vital part of auto body manufacturing,the weldability of TRIP steels is problematic,and this prevents its adoption for many applications in the automotive industry.This present work studies the effects of welding and post-weld heat treatment on the microstructure of TRIP steels.It is found that the microstructures of the fusion zone and the heat affected zone (HAZ) are changed after high-temperature heat treatment.Hardness tests revealed that fusion zone hardness decreased with increasing of temperatures in the post-weld heat treatment on the laser weld seam.The rolling performance of the welding seam and the seam of post-weld heat treatment were also studied.     

甲醇合成塔用 150 mm SA387Gr22C12 钢板组织和力学性能

对 150 mm 厚 SA387Gr22C12 钢板( / % : 0．13 ～0．14C,0．09Si,0．55 ～0．56Mn,0．004P,0．001S,2．48 ～2． 49Cr,1．11～1．12Mo) 模拟焊后拉伸性能、－29 ℃ 冲击性能、金相组织及回火脆化倾向评定等进行试验,并检测了交货态(正火 + 回火) 、最小模拟焊后态、最大模拟焊后态及步冷试验后的钢板各项性能指标 。结果表明,钢板的回火脆化 倾向不明显,其结果 CvTr55 + 2．5ΔCvTr55 为－63 ℃,完全满足甲醇合成塔用钢板的技术要求。     

Development of SA-533 Type B CL.1 + SA-240 Type 304L roll-bonded clad steel plate for safety injection tank of CAP1400 nuclear power plant

Aiming to meet the demand of the country' s nuclear demonstration project on the CAP1400 nuclear power plant,Baosteel uses the roll-bonding technology and develops the SA-533 Type B CL.1 + SA-240 Type 304L high-strength and high-toughness clad steel plate with a shear strength of over 310 MPa for the nuclear power plant' s safety injection tank.The properties of the quenched and tempered and the simulated post-weld heat treatment states are systematically studied herein through a comprehensive inspection and evaluation of the composition,microstructure,and properties of the clad steel plate.The results show that the bonding interface has high shear strength and that the base metal has high strength and good toughness at low temperatures.Hence,the performance fully meets the technical requirements of the CAP1400 nuclear power plant' s safety injection tank in the country' s nuclear demonstration project.The roll-bonded clad steel plate can be used to manufacture the safety injection tank of the CAP1400 nuclear power plant.     

含硼低裂纹敏感性钢板的研制

 通过连续冷却相?湫形芯亢腿仍ひ昭芯浚晒⒘?0~40mm厚的600MPa级含硼低裂纹敏感性钢板,并分析了热轧工艺对钢板组织和性能的影响。结果表明,较低二开轧温度(小于等于840℃),中等冷却速度(5~20℃/s)和较低终冷温度(小于等于500℃)可得到针状铁素体和贝氏体类组织,确保钢板高强韧性匹配［Rm≥620MPa;AKV(-40℃)≥100J］;同时钢板焊接性能较好,在热输入15~50kJ/cm之间,不用预热和焊后热处理,可得到满足母材性能要求的焊接接头。     

Role of Boundary Strengthening on Prevention of Type IV Failure in High Cr Ferritic Heat-Resistant Steels

Microstructure evolution of newly developed 9Cr-3W-3Co-V, Nb steel with boron addition (B steel) has been analyzed during HAZ thermal cycle at the peak temperature of around A_c3 (A_c3 HAZ) and post-weld heat treatment (PWHT) to elucidate the prevention mechanism of type IV failure by boron addition. It was found that enhancement of the boundary strengthening by precipitates is the main reason for prevention of type IV failure by boron addition. In B steel HAZ, original austenite is reconstituted through martensitic α to γ reverse transformation during the heating and original martensite is reconstituted through martensitic transformation during cooling of the A_c3 HAZ thermal cycle. This process allows M₂₃C₆ carbides to precipitate at the prior austenite grain (PAG) and block boundaries during PWHT even if the chemical segregation of carbide forming elements exists. The effect of boundary strengthening on the creep property has also been investigated. Microstructure evolution during creep was compared among Gr.92 with different A_c3 HAZ microstructures prepared by three kinds of heat treatments and B steel. The results revealed that both the boundary length and kernel average misorientation value decreased in all samples during creep. However, this process occurred very rapidly in A_c3 HAZ simulated Gr.92, whereas it was significantly retarded in the other samples with sufficient boundary strengthening by precipitates. This result confirms that the precipitates formed at PAG and block boundaries play the most important role to stabilize the microstructure of A_c3 HAZ simulated samples during creep and prolong the creep life.     

Evolution of Soft Zone in a Simulated 1.25Cr-0.5Mo Steel-Welded Joint During Post-weld Heat Treatment

In the present study, the effect of post-weld heat treatment on the soft zone of 1.25Cr-0.5Mo steel welded joint has been systematically studied. Outstanding features of the soft zone, including grain size, number density of carbides, volume fraction of carbides, and hardness distribution, are quantitatively analyzed by means of scanning electron microscopy and a microhardness testing. Results show that ferrite grain growth, carbide coarsening, and alloying element segregation are main factors accounting for hardness variations.

     

Overview of stainless-steel clad-plate welding

Types of bimetal clad plate,manufacturing methods,and their fields of application were summarized.In particular,key aspects of the welding of clad-rolled stainless steel were described,including the weldability of the base and clad metals,design criteria for the transition layer,the selection of the type of welding process and consumables used,types of blanking and welding bevels,preparation and assembly prior to welding,welding procedure requirements,post-weld cleaning and heat treatment,and welding quality inspection.This paper will serve as a reference for the welding technology used in future consumer applications in related fields.     

Metallographic examination of the heat-affected zone of a test weld in a type X 20 CrMoV 12 1 steel

Metallographic examination of a similar test weld in a type X 20 CrMoV 12 1 steel revealed a martensitic phase within the heat-affected zone of the base metal adjacent to the fusion boundary. As a consequence, the heat-affected zone displayed an excess microhardness compared with the unaffected base metal. It is shown that the occurrence of this martensitic phase can be correlated with segregations in the base metal. Due to its martensitic nature, this phase can be transformed to α-ferrite and carbide by an additional tempering treatment subsequent to the standard post-weld heat treatment. By this additional tempering treatment the uniformity of the microstructure of the heat-affected zone can be considerably improved.