Effect of Heat Treatment on Microstructure and Mechanical Properties of Ti-alloyed Hypereutectic High Chromium Cast Iron

Liu, Qiang; Hedström, Peter; Zhang, Hongwei; Wang, Qiang; Jönsson, Pär G.; Nakajima, Keiji

doi:10.2355/isijinternational.52.2288

Cited by 20 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature where ferrite → austenite transformation takes place was at approximate 703°C, which is estimated by the phase diagram of this alloy. 23) In addition, the volume of the ferrite increased with an increased temperature, as shown in Fig. 2(c).…”

Section: (B)mentioning

confidence: 66%

“…22,23) It consists of primary M7C3 carbides (> 11.2 μm) with a large hexagonal columnar structure, eutectic M7C3 carbides (< 11.2 μm) with an irregular shape, TiC carbides with a cubic structure, and a matrix mainly containing the austenite phase (γ ) in the as-cast condition (before heat treatment). After heat treatment, the matrix changes from austenite (γ) into martensite (α′ ) and the secondary carbides have precipitated from the matrix.…”

Section: Resultsmentioning

confidence: 99%

“…These direct data from the SEM observations is in agreement with our previous conclusions regarding the M7C3 carbides growth phenomenon. 23) Compared to the microstructure before heat treatment, it can be seen in Fig. 6(b) that the secondary carbides precipitate from the matrix during heat treatment.…”

Section: (B)mentioning

confidence: 99%

“…These precipitates increased with an increased temperature. However, the precipitates inside the samples were polished and studied carefully by using SEM after the heat treatment in our previous study 23) and none of precipitates were found on the surface of primary M7C3 carbides. Hence, this indicates that the observed feature on the primary M7C3 carbides is a surface phenomenon.…”

Section: (B)mentioning

confidence: 99%

See 3 more Smart Citations

Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

et al. 2013

Self Cite

View full text Add to dashboard Cite

In-situ observations on the dynamic precipitation behavior of secondary carbides in Ti-alloyed High Chromium Cast Iron (HCCI) were performed by using a Confocal Laser Scanning Microscope (CLSM). Moreover, the detailed characterization of the microstructure before and after heat treatment was performed by using scanning electron microscopy (SEM). The secondary carbides, which precipitate from the matrix during heat treatment, were identified as M7C3 type carbides by using transmission electron microscopy (TEM). The number, size and volume of secondary carbides during heating, holding and cooling process were quantitatively evaluated based on the in-situ observation and SEM results. It was found that ferrite (α) and secondary carbides start to precipitate from the matrix at around 575°C and 840°C, respectively, during the heating process. In addition, the in-situ results showed that the number of secondary carbides increase with an increased heating temperature and time. Moreover, it was found that the size of these secondary carbides increase at higher temperatures and longer holding times. However, the number of secondary carbides increased with a decreased temperature. Finally, it was found that the volume fraction (~5%) of secondary carbides was not changed to a large extent for the different heat treatment conditions being investigated.

show abstract

Section: (B)mentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: (B)mentioning

confidence: 99%

Section: (B)mentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…11,15,16) The as-cast samples, which were used for analyzing the maximum carbides size, were cut from an ingot and from a position near the thermocouple, as seen in Fig. 3.…”

Section: Experimental Materials and Measurementmentioning

confidence: 99%

Estimation of the Maximum Carbide Size in a Hypereutectic High Chromium Cast Iron Alloyed with Titanium

2013

Self Cite

View full text Add to dashboard Cite

In this study, in order to obtain complete size distribution results, the maximum carbide size in a Fe-17 mass% Cr-4 mass% C hypereutectic High Chromium Cast Iron (HCCI) produced with different cooling conditions, titanium additions and heat treatment conditions was determined by using the statistics of extreme values (SEV) method. In addition, the shape factor, circularity, was estimated in order to classify the type of carbides (primary M7C3 carbides, TiC carbides and secondary M7C3 carbides). Compared to the smaller size carbides, such as TiC carbides and secondary M7C3 carbides, it was found that the slope of the extreme value distribution (EVD) regression lines is lower for the large sized carbides such as primary M7C3 carbides than for the smaller carbides. Moreover, it was found that the circularity value for the larger size carbides is higher than for the smaller carbides. Furthermore, the estimated and observed maximum carbide sizes were compared with each other for all carbide types. The characteristic of the different carbide types are summarized and classified based on the shape factor. Finally, the relationship between the carbide size distribution including the maximum carbides size and mechanical properties is discussed based on the combination of a size distribution analysis and a maximum size analysis.

show abstract

Effect of aluminum on the primary carbides of a hypereutectic high chromium cast iron

Xing

Han

Lui

2015

Materialwissenschaft Werkst

View full text Add to dashboard Cite

The effect of aluminum on the primary M7C3 carbides of a hypereutectic high chromium cast iron containing 4.0 wt% carbon and 20.0 wt% chromium was studied by means of optical microscopy, scanning electron microscope (SEM), energy dispersive X‐ray spectrometry (EDX), water quenching, and differential thermal analysis (DTA). Compared with specimen without aluminum addition, the primary carbides were all refined when different amount of aluminum was added into the melts, but the primary carbides in specimen with 0.3 wt% aluminum were the finest. With the addition of aluminum, aluminum element enriched at the boundary of primary carbides during solidification and was beneficial for the refinement of primary carbides. However, the increase of primary carbide growth time with the increase aluminum content had adverse effect on the refinement of the primary carbides. The comprehensive influence of those two factors leaded to the result that the primary carbides in specimen 1 with 0.3 wt% aluminum were the finest.

show abstract

Effect of Heat Treatment on Microstructure and Mechanical Properties of Ti-alloyed Hypereutectic High Chromium Cast Iron

Cited by 20 publications

References 16 publications

Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

Estimation of the Maximum Carbide Size in a Hypereutectic High Chromium Cast Iron Alloyed with Titanium

Effect of aluminum on the primary carbides of a hypereutectic high chromium cast iron

Contact Info

Product

Resources

About