scholarly journals Effects of Boron Content on the Microstructure and Impact Toughness of 12Cr1MoVR Low-Alloy Heat-Resistant Steel Weld Metals

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 926
Author(s):  
Guishan Dou ◽  
Rui Cao ◽  
Changliang Cai ◽  
Cheng Han ◽  
Xili Guo ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Resistant Steel ◽  
Steel Weld ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Weld Metals ◽  
Austenite Grain ◽  
Alloy Heat ◽  
The Impact ◽  
Prior Austenite Grain

The impact toughness of low-Cr heat-resistant steel weld metal is an important problem to broaden the application of low-Cr heat-resistant steel. In this study, the microstructure and impact toughness of 12Cr1MoVR low-alloy heat-resistant steel weld metals with various boron contents (B1 = 0.0028%, B2 = 0.0054%, and B3 = 0.0079%) were investigated. The microstructures of all weld metals were composed of block ferrite, carbides, and inclusions. Results indicated that with increased B content, prior austenite grain sizes decreased, and minor microstructure changes could be found. With the increase in B content from 0.0028% to 0.0054% to 0.0079%, the ductile–brittle transition temperature of the weld metals decreased from 30 to 0 to −14 °C, the toughness of weld metal increased, and the hardness slightly decreased, all of which are directly related to the refinement of prior austenite grain size because of the addition of B content. However, on the top-shelf zone, such as at the testing temperature of 80 °C, ductile fracture dominates the fracture surface; with the increase in B content, the size and density of inclusions increased gradually, which led to the decrease of the impact toughness at 80 °C when the B content was 0.0079%.

Quench Brittleness of 12%Cr Martensitic Heat-Resistant Steel

2011 ◽  
Vol 479 ◽  
pp. 8-12 ◽  
Author(s):  
Gang Yang ◽  
Zheng Dong Liu ◽  
Shi Chang Cheng ◽  
Mu Xin Yang
Keyword(s):  
Impact Toughness ◽  
Cooling Rate ◽  
Microstructural Characterization ◽  
Temper Brittleness ◽  
Resistant Steel ◽  
Slow Cooling ◽  
Continuous Precipitation ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
The Impact

The mechanism of brittleness due to slow cooling during quenching was experimentally investigated in 12% Cr martensitic heat resistant steel. The mechanical property tests and microstructural characterization by SEM、TEM and XRD were conducted. The results showed the impact toughness would decrease with the slowing of cooling rate during quenching, and the low cooling rate within the temperature range from 820 to 660 °C played a significant effect on the impact toughness . Different from the mechanism of temper brittleness, the main causes of embrittlement due to the slow cooling upon quenching were both the continuous precipitation of M23C6 along prior austenite grain boundaries during the process of slow cooling and that of M2C along prior residual austenite film during tempering, and this kind of quench brittleness was nonreversal.

Correlation between Microstructure and Nanohardness in Advanced Heat-Resistant Steel

2006 ◽  
Vol 326-328 ◽  
pp. 277-280
Author(s):  
Jae Il Jang ◽  
Sang Hoon Shim ◽  
Shinichi Komazaki ◽  
Takayuki Sugimoto
Keyword(s):  
Prior Austenite ◽  
Complex Structure ◽  
Strengthening Mechanism ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Austenite Grain ◽  
Heat Resistant Steels ◽  
Prior Austenite Grain

As advanced ferritic/martensitic heat-resistant steels generally have a complex structure consisting of several microstructural units (lath, block, packet, and prior austenite grain), it is very hard to separate the contribution of each microstructural unit (or its each boundary) to the strengthening mechanism in such steels. Here we explore the role of each microstructural unit in strengthening of advanced high Cr steel through nanoindentation experiments performed at different load levels. Nanoindentation results are analyzed by comparing with microstructural observations and discussed in terms of prevailing descriptions of strengthening mechanism.

scholarly journals The impact toughness of a nitride-strengthened martensitic heat resistant steel

2012 ◽  
Vol 55 (7) ◽  
pp. 1858-1862 ◽  
Author(s):  
WenFeng Zhang ◽  
Wei Yan ◽  
Wei Sha ◽  
Wei Wang ◽  
QiangGuo Zhou ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
The Impact

scholarly journals Microstructure and Mechanical Properties of an Austenitic Heat-Resistant Steel after Service at 570 °C and 25.4 MPa for 18 Years

2021 ◽  
Author(s):  
Xu Yang ◽  
Chengwei Yu ◽  
Xisheng Yang ◽  
Kai Yan ◽  
Gong Qian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Power Plant ◽  
Impact Toughness ◽  
Grain Boundary ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Microstructure And Mechanical Properties ◽  
The Impact

AbstractMicrostructure and mechanical properties of an austenitic heat-resistant steel (12Cr18Ni12Ti) serviced in a supercritical power plant at 570 °C/25.4 MPa for 160,000 h were investigated. The results show that the hardness and the tensile strength did not decrease; however, the impact toughness was remarkably reduced. The TiC precipitate shows excellent thermostability; for example, it hardly grew up, and no big M23C6 carbides were found. However, large Fe, Cr-rich σ-phase was doomed to precipitate along grain boundary, which should be responsible for the reduced toughness. The growth of σ-phase was observed to have an interaction with the preexisted carbides.

Experiment Study on Cutter Disrepair Principle and Optimization for Machining Heat-Resistant Steel

2012 ◽  
Vol 500 ◽  
pp. 58-64
Author(s):  
Yao Nan Cheng ◽  
Xian Li Liu ◽  
Fu Gang Yan ◽  
Zhen Jia Li ◽  
Xian Zhou Wang
Keyword(s):  
Mathematic Model ◽  
Resistant Steel ◽  
Experiment Study ◽  
Premature Failure ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Design Production ◽  
Milling Temperature ◽  
The Difference ◽  
The Impact

In order to find out the cutter disrepair principle and provide a valuable reference for the design, production and use of the heavy-duty hard alloy cutter, have experiment study on machining the heat-resistant steel-the 3Cr-1Mo-1/4Vsteel. First, have impact disrepair experiments with several types of different grooves milling inserts, and find out the difference of the impact disrepair invalidation types among them, and build the impact disrepair life cumulating distribution function mathematic model. Second, based on the adhering disrepair experiments, find out the difference of the adhering disrepair invalidation types, build the quantitative mathematic relation between milling temperature and maximal adhering disrepair depth on rake face of the cutter, and analyze the rule that the milling temperature affects the adhering disrepair. And then, on the basis of the scene machining, have analysis on cutter disrepair phenomenon and mechanism under the joint action of force and heat, so to provide a theoretical basis on how to avoid premature failure of the tool for the actual production process.

scholarly journals Effect of delta ferrites on the anisotropy of impact toughness in martensitic heat-resistant steel

2019 ◽  
Vol 8 (2) ◽  
pp. 1781-1788 ◽  
Author(s):  
Junru Li ◽  
Lianjun Cheng ◽  
Pengfei Zhang ◽  
Liwei Wang ◽  
Hong Li
Keyword(s):  
Impact Toughness ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant
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